West Ham eye Kevin Kuranyi
The 29-year-old Germany international will become a free agent this summer and West Ham co-owner David Sullivan is monitoring the situation.
Moscow Dynamo have also been linked with Kuranyi, who has an impressive scoring record.
Kuranyi previously played for Stuttgart, where he scored 46 goals in 99 matches. Since moving to Schalke, he has netted 71 goals in 157 appearances, including 20 in 32 matches this season.
Although qualified to play for Brazil, Kuranyi opted to play for Germany and has found the net 19 times in 52 senior caps.
Kuranyi was embroiled in controversy two years ago when, after being left out of the Germany team to play Russia, he walked out of the stadium at half-time and failed to return to the team hotel.
Sullivan and co-owner David Gold have already confirmed they will be spending during the summer transfer window.
The Upton Park club have already been linked with a clutch of players, including West Brom’s Graham Dorrans, Portsmouth’s Kevin Prince Boateng, Tottenham midfielder Jamie O’Hara and Burnley forward Chris Eagles.
An agent acting on behalf West Ham, who are involved in a derby at Fulham on Saturday, is also due to fly out to Argentina tomorrow as the club step up their bid to strengthen their squad.
Sullivan said: “There will be up to 20 bids or approaches for every one player we are able to sign. I don’t want them to feel let down if we go for players and don’t get them.”