Ba, 31, had netted 14 goals in 18 appearances for Shanghai Shenhua this season but appeared to badly break his leg in a tangle with a Shanghai SIPG FC defender.
The Senegal international was taken off on 70 minutes as Fredy Guarin’s late penalty saw Shenhua pick up a 2-1 win after almost 10 minutes of injury time which included the sending off of Jiajie Wang.
The Premier League club tweeted: “All at Chelsea FC send our best wishes to former striker @dembabafoot. Get well soon Demba.”
“It could end Ba’s professional career. I would rather lose the game than lose Ba. God is unfair. Ba is too good to have this happened to him.”
Make Money Online in Nigeria... Click HERE To Start Now!