Glasgow Rangers head coach Russell Martin may have to deal with some of his top performers moving on from Ibrox before the end of the summer transfer window.

One club have reportedly made a bid of up to £10m to sign Mohamed Diomande from the Scottish Premiership giants, and his future in Glasgow remains uncertain.

Belgium international Nicolas Raskin, meanwhile, is a reported target for Premier League teams in England this summer.

This shows that the Rangers boss has to be concerned about whether or not he will have his key midfielders available when the real action gets underway later this month.

However, there will also be players whom Martin and the club more broadly will want to see leave before the summer transfer window slams shut at the start of September.

One such player the Gers may want to sell could be central defender Robin Propper, who has been linked with a move away from Ibrox in recent weeks.

Why Rangers should sell Robin Propper

Rangers only signed the Dutch centre-back from FC Twente last summer, as Philippe Clement brought him to Glasgow to bolster his defensive options, but they should move on from him already.

FC Twente have already reportedly held talks with the veteran central defender over a potential return to the Netherlands, and the Light Blues should take advantage of their interest.

The Eredivisie outfit being keen to bring Propper back to the club means that the Gers have an opportunity to recoup some of the money that they spent on him, and save money on his wages for the upcoming campaign.

Rangers should be looking to cash in on the 31-year-old flop before the end of the summer transfer window because he simply did not adjust to the physicality required at Ibrox.

In the 2024/25 Europa League, for example, the centre-back lost 55% of his ground duels and 56% of his aerial battles, which shows that opposition players found it far too easy to get the better of him on the deck and in the air in physical contests.

As you can see in the table above, Propper became a bit-part player by the end of the season, starting just three of his last ten appearances in the matchday squad.

Therefore, the Dutch flop, despite managing a goal against Celtic, should be dispensable this summer and allowed to return to FC Twente.

English club bid for Rangers flop

As well as selling Propper, the Scottish Premiership giants may be able to cash in on another flop before the summer transfer window slams shut, amid interest in one of their midfielders.

According to GIVEMESPORT, Birmingham are eyeing up a move to sign attacking midfielder Kieran Dowell on a permanent deal from the Light Blues.

The report claims that the Championship side, who won the League One title last season, have tabled an offer to bring the £16k-per-week earner back to St. Andrew's for the 2025/26 campaign.

It states that the Blues are waiting on a decision from Rangers after submitting their bid, as it remains to be seen whether or not Martin will want Dowell to be a part of his plans next term.

Why Rangers should sell Kieran Dowell

The former Scotland international must decide that the attacking midfielder is not a part of his plans for next season and tell Kevin Thelwell to agree a deal with Birmingham after the English side submitted a bid for his services.

Dowell should be viewed as being as dispensable as Propper at Ibrox this summer, given what he has produced in a Rangers shirt up to this point.

The 27-year-old dud arrived in Glasgow on a free transfer from Norwich City in the summer of 2023 and has only produced two goals and two assists in 32 appearances for the club in all competitions to date.

These statistics show that Dowell has not delivered anywhere near enough quality in front of goal for a player who is tasked with making an impact as a scorer and a creator in a number ten or wide position.

His performances in the Premiership during the first half of the 2024/25 Premiership campaign for Clement led to him being moved out on loan to Birmingham in January.

As you can see in the table above, Dowell did not earn a place in the starting XI on a regular basis, and failed to contribute a single goal or assist, before his temporary exit.

Rangers must now, therefore, make his exit a permanent one by accepting Birmingham's offer to sign him this summer, as he has failed to prove that he has what it takes to deliver consistent quality for the Light Blues at Ibrox.

The former Canaries star does not appear to have the potential to be a key player for Martin moving form, given what he has shown in Scotland so far, which is why the midfielder should be as dispensable as Propper.