It has been reported that Premier League club Palace are confident of re-signing Mamadou Sakho from Liverpool in the summer transfer window, and that Wimmer is seen as a back-up option if a deal to sign the France international collapses.
Stoke City are interested in the 24-year-old Tottenham centre-back, according to the report, which also claims that the Austria international has rejected a move to West Bromwich Albion in the summer transfer window.
Sakho played well for Palace during the second half of last season on loan from Liverpool.
The 27-year-old centre-back knows the Premier League well, and the former Paris Saint-Germain man would be a good signing for Palace.
Wimmer is a good defender as well and is three years younger, but the Austrian has less experience of English football than Sakho.