Blues have joined the three-horse race to sign the highly rated striker.
Dylan Saint-Louis, who spent last season on loan at French Ligue 2 side Stade Laval, is also attracting interest from Norwich and QPR.
The 22-year-old made 32 appearances last season, scoring seven goals and getting two assists.
The Congolese frontman has just one year left remaining on his current deal and his parent club are looking for a fee in the region of £525k.
QPR boss Ian Holloway confirmed yesterday that they are “down the road” with some potential transfer targets, and it’s thought that Saint-Louis could be someone on the club’s radar.
Source – Get West London