In the end, the 2020/21 season can surely only be considered a successful one for those associated with Watford.

Following relegation from the Premier League at the end of the previous campaign, the Hornets responded in brilliant fashion this time around, winning an immediate promotion back to the top-flight of English football with a second-placed finish in the Championship table.

Now, Watford will be planning for a busy summer transfer window, as they look to put together a squad that will be able to keep them in the Premier League next season.

However, it is also likely that the success Watford have enjoyed this season, means that a number of other clubs will be taking an interest in some of the Hornets' own players as we approach the transfer market.

Should that be the case, then there are several individuals who would surely earn Watford a considerable amount of money were they to be sold this summer.

So with that in mind, we've taken a look here, at who we think are the ten most valuable players in Watford's current squad.

We start this list with a player whose future at Vicarage Road as been the subject of much speculation recently, in the form of Kiko Femenia.

Recent reports have claimed that Turkish side Trabzonspor are interested in a move for the full-back this summer, although Femenia himself has said he is happy at Watford, where it has been suggested he remains under contract for the time being, meaning clubs would have to pay to sign him this summer.

Given his experience of top-flight football, both with Watford and previously with Alaves in Spain, keeping Femenia at Vicarage Road certainly seems like a smart thing to do for the Hornets, after the important role he played in promotion in the past few months.

One player who only joined Watford last summer who could have a significant part to play for the club in the years to come, is William Troot-Ekong.

Having signed a contract with the Hornets until the summer of 2025 upon his arrival from Udinese, the centre back is one who ought to be in it for the long-haul at Vicarage Road, and he was a regular feature in this season's promotion winning side when fit.

Troot-Ekong's top-flight experience in countries such as Italy, Turkey and Belgium, not to mention his international pedigree that saw him represent Nigeria at the last World Cup, also mean he ought to be a useful asset for Watford on their return to the Premier League next season.

It was a bit of a stop start time to Ken Sema's Watford career, with the Swede loaned out to Udinese last season, just a year after his arrival at Vicarage Road.

This season however, has seen Sema play a significant role in promotion for Watford, scoring five goals and providing five assists on the way to promotion to the Premier League, and that has reportedly already seen him extend his contract, which was set to run until the summer of 2023, until the end of the 2025/26 season.

As a result, it seems as though Sema is going to have a part to play at Watford for many years to come now, unless another club is going to be willing to pay a significant fee to prise him away from Vicarage Road.

Having been a Watford player for some time now, Tom Cleverley's continuing importance to this side is still there for plenty to see.

The midfielder often wore the captain's armband this season in the absence of Troy Deeney, while by all accounts, the lift that Watford enjoyed when Cleverley returned from his own injury in the final few months of the season was a noticeable one.

With that in mind, Cleverley's leadership, and top-flight experience, could be crucial for Watford, who moved to secure the former England international on a deal until the summer of 2023 during the early part of this season, highlighting the value of the 31-year-old to the club.

Another midfielder whose experience has proved useful to Watford at times this season, is Will Hughes.

Despite having seemingly been around for a considerable time now, Hughes is still only 26, meaning he still has plenty more to give, following a campaign where he has produced some influential performances for Watford in the centre of the park on the way to promotion.

Indeed, it does seem as though Hughes is also keen to extend his stay at Vicarage Road - admitting as much in a recent interview - and given he did make a useful contribution this season, you would imagine the Hornets will be happy ensure he does that, with the midfielder approaching the final 12 months of his current deal with the club.

One player who it appears is set to be a big prospect for the future at Vicarage Road, is Jeremy Ngakia.

Watford seemingly pulled off something of a coup when they secured the signing of the 20-year-old full-back following the expiry of his contract with his West Ham last summer, despite their relegation from the Premier League.

Ngakia has since gone on to play a useful role for the Hornets in securing their immediate return to the top-flight, and with plenty of time to improve, as well as three years remaining on his current contract with Watford, the young defender could become a useful asset for the club in the next few seasons.

The 2020/21 season felt like something of a breakthrough campaign for Nathaniel Chalobah at Vicarage Road.

Opportunities had previously not always been forthcoming since his return to the club from Chelsea on a permanent basis in 2017, but this season saw him become a regular and reliable feature at the heart of Watford's midfield, even wearing the captain's armband on occasion, a sign of how highly he is now viewed at the club.

As a result, with his current contract set to expire at the end of next season, you feel Watford will be keen to secure a new deal for a player who now has the potential to become a key figure for them, sooner rather than later.

The situation surrounding Adam Masina's time at Watford so far does seem to be something of an intriguing one.

Despite an injury-hit spell at Vicarage Road meaning he has been restricted to just 74 appearances in three seasons for the club since joining from Bologna in 2018, the left-back has still clearly impressed for the Hornets, as evidenced by the fact he was the only Watford player included in this year's Championship team of the season.

Taking that into consideration, you feel that if Masina can put those issues behind him, then he can be an important player for the club next season, with two years remaining on his current contract with the club.

After joining Watford from Fluminense in his native Brazil in January 2020, Pedro has enjoyed a breakthrough year at Vicarage Road this season.

With nine goals and two assists in 38 league appearances - including some spectacular strikes - the attacker has played a big role for the Hornets in securing their immediate promotion back to the Premier League.

Given he is still only 19, the fact that he is making and that impact, along with recent reports that Watford have now extended his contract until the summer of 2027, means he could be a major asset to the club in a number of ways over the next few years.

Ultimately, it ought to be no surprise to see that it is Ismaila Sarr who claims top spot on this particular list for Watford.

Despite relegation last season, the Hornets stood their ground to keep the attacker at Vicarage Road despite reported interest from the likes of Liverpool and Manchester United, something that paid off, as Sarr top scored with 13 league goals for the club - also providing four assists - to help them secure promotion back to the Premier League.

It was suggested last summer that Sarr would have cost £40million, and Watford's return to the Premier League, combined with the fact that there are three years remaining on his contract - putting them in a strong position to negotiate any offers that come in for him - means they could demand even more than that this time around.