Nottingham Forest are certainly no strangers to making moves in the transfer market.

Last summer, after Forest narrowly missed out on a play-off finish under Sabri Lamouchi, they brought in 13 new players before the Frenchman was sacked four games into this season.

Chris Hughton added Anthony Knockaert to his squad shortly after his arrival at the City Ground, but the changes have failed to pay off and they are languishing in the bottom half of the Championship table.

Forest, especially in recent years, have invested heavily in the playing squad as they try to escape the clutches of the Championship.

Some of those players have proved to be money well spent. Some have proved to be wastes of money, as is the case with many signings.

Here, we take a look at Forest's top 10 most expensive signings and have a look at what they are up to nowadays.

John joined Forest for a fee of $3.42million from Columbus Crew in 1999.

The Trinidad and Tobago scored 55 goals in 70 games for the Columbus Crew, and found the net 13 times in 26 games in the First Division for Forest in 2001/02.

John later signed for Birmingham City in 2002 after spending three years at Forest, before going on to have spells with Coventry City, Southampton and Sunderland.

The striker finished his career at Central FC back in his native, after a brief spell with Solihull Moors in non-league.

He is Forest's tenth most expensive signing in the club's long, established history.

Campbell joined Forest from Arsenal for an initial fee of £2.5million, however Transfermarkt believe that a deal rose to over £3.7million.

The 51-year-old ended up scoring over 30 goals for the Reds in nearly 90 appearances for the club, before leaving for Trabzonspor in 1998.

He later went on to have spells with the likes of Everton, West Bromwich Albion and Cardiff City before ending his career.

His son, Tyrese, plays in the Championship for Stoke City and is one of the best up and coming forwards in the division.

His dad definitely made an impact during his time at Forest.

Scimeca joined Forest on an initial £2.5million deal, with Transfermarkt claiming that a deal eventually rose to over £4million.

The defender made over 150 appearances for the Reds after joining from Aston Villa in 1999, before going on to have spells with Leicester City, West Bromwich Albion and Cardiff City.

Scimeca took the captaincy at Forest after Steve Chettle left the club, and formed a solid defensive partnership with Jon Olav Hjelde during his time at Forest.

He scored four goals in his final season at the club after being deployed mainly as a defensive midfielder.

Johnson joined Forest from Ipswich Town for a fee of around £4.05million according to TM.

The striker went on to have an excellent spell at the City Ground, scoring 29 goals in 47 matches in all competitions as Forest reached the play-offs in 2002/03.

Before then he had fallen out of favour at the City Ground and had loan spells with Sheffield Wednesday and Burnley.

In September 2006, he retired from the game due to injuries.

His son, Brennan, is currently on Forest's books and is having a superb season in League One with Lincoln City.

Mbe Soh joined Forest from French giants Paris Saint-Germain in the summer. The fee was undisclosed, but Transfermarkt believe that it was a deal worth around £4.50million.

The young defender made three first-team appearances for PSG during his time with the club, and has since failed to really make an impression at Forest.

He has made seven appearances in the Championship and has scored one goal, and will be hoping to feature more regularly in 2021/22.

Chris Hughton has praised his work ethic and attitude towards training on numerous occasions, and with Michael Dawson and Michael Hefele likely to leave this summer, next season could be a big one for Mbe Soh.

Another summer signing whose fee was undisclosed when he first joined is Harry Arter.

Arter has also been unable to make an impact for Forest this season in a campaign which has been hampered by injury.

The 31-year-old has made only 13 appearances in the Championship, and only eight of them have been starts.

There was speculation about him potentially leaving the club back in January, with FLW's George Harbey understanding that he was offered out on loan, but a move broke down due to wage demands.

He is said to have cost £4.95million in the summer.

In at number four is Pierre van Hooijdonk.

The striker cost around £4.50million initially, but the deal is said to have risen to around £5.40million.

His first season wasn't the greatest, as he scored only one goal in eight Premier League appearances and was unable to prevent the Reds from finishing bottom.

But 29 league goals in 42 appearances followed the next season, and he struck up an excellent partnership with Campbell.

He later moved to Vitesse after a controversial end to his time at Forest, and he went on strike for a brief amount of time.

Into the top three is Lewis Grabban.

Grabban joined Forest from AFC Bournemouth in 2018, signing for around £6million after impressive loan spells with Sunderland and Aston Villa.

Grabban scored 17 goals in his first season at the club, and last season, he became the first player since 2003 to score 20 goals in a league campaign.

He has scored three goals in 20 league appearances for Forest this season and has endured difficulty with a hip injury.

But the striker has been a great servant and will still have plenty to offer in a Garibaldi shirt.

Narrowly missing out on top spot is Britt Assombalonga.

Assombalonga joined Forest from Peterborough United for an initial fee of £5.5million, rising to what is believed to be around £6.2million.

The striker scored 15 goals in 29 games in his first season at the City Ground. In total, he scored 30 goals in 69 games for the club.

He later moved to Middlesbrough in 2017 for a fee of £15million, after his time at Forest fizzled out due to injuries.

Finishing top by some distance is Joao Carvalho.

Carvalho joined Forest for a club-record fee of £13.2million in the summer of 2018, as Aitor Karanka began to strengthen his squad.

The midfielder took time to settle under Karanka, but after finding his form, he found it hard to make an impact under Martin O'Neill.

He picked up an injury in pre-season last term which set him back under Sabri Lamouchi, and despite featuring against Barnsley in the opening game of this season, he was sent out on loan to Almeria in the summer.

Almeria have an option to buy Carvalho at the end of his loan spell, meaning that he may well have had his last kick in a Forest shirt.