Former Palace midfielder Watson, on loan from Wigan following his £2million switch from Selhurst Park in January, has missed the last two games through suspension after his recent dismissal against Reading.
Mikele Leigertwood could drop back to replace Peter Ramage at full-back to accommodate Watson's return.
Fellow midfielder Gavin Mahon faces a late fitness test after missing last Friday's home defeat to Leicester with a hip injury.
Manager Jim Magilton has no other new injury or suspension problems and is not expected to make many, if any, further changes to his side, who will climb into fifth place in the table with victory over their London rivals.
Kick-off 8pm.
