The Premier League club appear to be monitoring the midfielder's progress.
Southampton and Leicester City have been linked with Tonny Vilhena.
Reports suggest the Foxes have been monitoring the midfielder for some time and could now be poised to make a move for his signature.
Leicester, Sunderland and West Brom are keen on signing Tonny Vilhena.
Tonny Vilhena has been watched by Leicester, Southampton and Swansea.
Feyenoord winger Tonny Vilhena is said to be on the verge of a move to Sunderland.
West Ham United, Sunderland and Bournemouth have been linked with Tonny Vilhena.
The midfielder was seen to kick Miquel Nelom during the confrontation.
Southampton have been linked with Feyenoord midfielder Tonny Vilhena.
Ronald Koeman wants to sign Feyenoord midfielder Tonny Vilhena.