Timothy Fosu-Mensah is expected to miss the rest of the season after suffering a suspected dislocated shoulder at the end of Thursday's Manchester derby in the latest blow for Jose Mourinho.

The Manchester United utility player was introduced as an 86th-minute substitute but left the field in pain after landing awkwardly on his right shoulder during a challenge.

Fosu-Mensah, 19, posted two pictures on Instagram on Thursday of him receiving treatment but scans that night are thought to have confirmed his worst fears. He will undergo more assessment on Saturday to determine the full extent of the injury and establish if there is any serious ligament damage to the shoulder.

Fosu-Mensah's injury, which Mourinho had described as "significant" leaves the United manager without eight senior players for the visit of Swansea City to Old Trafford on Sunday.

As well as the injured Paul Pogba, Juan Mata, Zlatan Ibrahimovic, Marcos Rojo, Chris Smalling and Phil Jones, United will be without Marouane Fellaini for the next three matches after he was sent off for headbutting City striker Sergio Aguero in the 84th minute of Thursday's goalless draw.

But the Football Association confirmed on Friday that Fellaini will not receive an extra game ban for his angry reaction to being sent off, even though the United midfielder has been warned about his future conduct after initially refusing to leave the field.