Manchester United manager, Jose Mourinho, believes forward Alexis Sanchez is facing “a long time” out, after suffering an “aggressive” hamstring injury in training.
United released a statement on Thursday, saying they were investigating the severity of the problem Sanchez had suffered.
Mourinho fears the Chile international may not return until 2019.
He said on Friday morning: “No scans yet but the player is experienced, the player knows what the injury is.
“And also, from the top of my experience, the painful scream, and the way the injury happened, I know that it is going to be for a long time.
“It is not a little muscular injury that, in one week or 10 days, the player is ready.
“For me and also Alexis, the feeling before the scans is that the grade is different than the (Victor) Lindelof one, and the Lindelof one was not an easy one.
“So, I think Alexis has what I used to call an aggressive muscular injury.”
Sanchez has been in and out of the United team this season so far and he was left out of the squad altogether for Tuesday’s Champions League win over Young Boys.