Mourinho: Aguero acted smart in Fellaini's sending off
Following the 0-0 draw at the Etihad, Man United boss Jose Mourinho expressed his concern about the defender.
"Tim Fosu-Mensah is injured," the United manager told Sky Sports.
"He’s really injured in the last action of the game, in the last tackle he was on the floor, and it's also an important injury."
Mourinho did not disclose what injury Fosu-Mensah had suffered.
PA
Manchester United's Timothy Fosu-Mensah winces in pain
But the 19-year-old has taken to Instagram to revealed the extent of his problem.
Fosu-Mensah posted a picture of himself on a treatment table with the club doctor.
Instagram
Fosu-Mensah's Instagram post
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And Fosu-Mensah's right arm was in a sling which puts his participation in Sunday's game against Swansea in major doubt.
It would be another blow for Mourinho, who must contend with several players out.
Paul Pogba, Zlatan Ibrahimovic, Chris Smalling, Phil Jones Marcos Rojo and Juan Mata are injured while Marouane Fellaini is suspended.