The summer transfer window will no doubt be a fascinating one for those associated with Millwall.

Gary Rowett's side ended the 2020/21 Championship campaign 11th in the second-tier table, something they will be looking to build on with a push for the play-offs, and promotion to the Premier League next season.

But having ended the current campaign by thrashing Bristol City 4-1 and then being stunned by an embarrassing 6-1 defeat to Coventry in their final two games, it seems clear that there is both potential to mount a push for the top six, and much to improve on at The Den if they are to do that.

As a result, the Lions could certainly be busy when the market reopens as they look to put a squad in place that can build on the good, and eradicate the bad in 2021/22.

So with that in mind, we've taken a look at four signings, and four departures, we could see at Millwall this summer.

One familiar face it appears we will be seeing back at The Den next season, is that of left-back Scott Malone.

The defender re-joined Millwall on loan from Championship rivals Derby County back in the summer transfer window, and has been a regular feature in Rowett's side throughout the course of the campaign, scoring five goals in 41 league appearances for the club this season.

Rowett has suggested recently that Millwall are close to agreeing a deal to re-sign Malone on a permanent basis this summer, and with his contract at Pride Park expiring this summer, it does seem as though the circumstances are right for such an agreement to be reached.

Another player we could see arriving at Millwall over the course of the summer, is midfielder Luke McCormick.

The 22-year-old has spent this season on loan at Bristol Rovers from Chelsea, making 42 appearances in all competitions and scoring six goals, although he was unable to prevent the Gas from suffering relegation to League Two after finishing bottom of the third-tier.

Reports in March suggested that Millwall are keen on McCormick, who is expected to leave Chelsea permanently this summer, a year before his contract expires, in search of more regular first-team football, which could open the door for the Lions when it comes to this signing.

One other target who Millwall may have been handed an opportunity to swoop in and sign in the past few days, is Allan Campbell.

Millwall, along with fellow Championship side Luton Town, were linked with a move for the Motherwell midfielder earlier this year, and it now seems as though their hopes of bringing the 22-year-old to The Den have now been given a rather significant boost.

Speaking on Monday, Motherwell manager Graham Alexander revealed he had been unable to convince Campbell to sign a new contract with the Scottish Premiership club, meaning he is now set to leave Fir Park when his current deal expires this summer, making him available for the likes of Millwall on a free transfer in the next few weeks.

As evidenced by that hammering at the hands of Coventry on the final day of this season, defence may be an area that Millwall need to address come the summer transfer window.

One potential candidate that the club could look to do that with, is Hibernian centre back Ryan Porteous, who Millwall reportedly saw a bid rejected for in the final days of this season's January transfer window.

Even this summer, there will still be two years remaining on Porteous' contract with Hibs, meaning a deal will still not be easy for Millwall to secure, but it could be worth them giving this another shot, considering the fact that at 22, the centre back is a player who could be an asset for them for many years to come.

In terms of outgoings, one player we may yet see depart The Den - on a temporary basis at least - this summer, is Tyler Burey.

The midfielder has struggled to really get regular game time for Millwall since joining the club from League One side AFC Wimbledon in the summer of 2019, making just 14 league appearances for the Lions - all from the bench - since then.

Speaking after that final day defeat to Coventry, Rowett admitted that there is an argument that the 22-year-old could benefit from regular football with a loan move elsewhere next season, and the opportunities and performances we see in pre-season, could be telling with regards to Burey's short-term future.

One player who finds himself in a very similar position to Burey at Millwall as we arrive at the end of the season, is Hayden Muller.

Like Burey, Muller has also struggled for regular game time since breaking into the Lions' senior squad at the back-end of last season, with the 19-year-old defender making just four senior appearances across all competitions for Rowett's side.

As a result, it is perhaps no surprise that Muller is another player who Rowett has revealed could be in contention for a loan move away in order to experience football week in week out, once the transfer market has reopened.

In terms of more senior players, one who it could be worth Millwall considering moving on come the summer, is Ben Thompson.

Given those aforementioned links with the likes of McCormick and Campbell, Rowett may need to move some midfield players on in the summer, to make room for those potential new arrivals in the centre of the park.

Considering Thompson reportedly had interest from his former loan club Portsmouth back in the January window, and the fact that he has never really managed to establish himself in Millwall's lineup this season - starting just 16 league games across the course of the campaign - he may be one candidate for a sale in the coming weeks.

Given his influence and importance to the side, Millwall are admittedly unlikely to want Jed Wallace to leave the club this summer.

Even so, there may yet be the possibility that the club will have to make a decision on Wallace in the next few months, given that as things stand, the winger is about to enter the final year of his contract with the club.

As a result, if Millwall's talks over a new deal are unsuccessful, and an offer does come in for him - Aston Villa are among those to have previously been linked - the club may have to consider cashing in on him while they can, to avoid losing such a valuable player for nothing when his deal with the club expires at the end of the 2021/22 campaign.