Manchester United boss Jose Mourinho has admitted that he is "not sure" how involved Wayne Rooney will be in Thursday's Europa League Group A clash with Zorya Luhansk.

Mourinho has claimed that he was "completely convinced" of the Red Devils captain featuring in the European match, but is wary of placing more pressure on the 30-year-old, whose performances continue to be closely monitored.

"I was completely convinced of playing him tomorrow," Mourinho told reporters.

"I'm not sure if I do that because with the situation that you create to him I think he really can't afford to have a performance that is not really good and I am here to protect him and have to analyse the best thing for him. If he is not totally ready for it, I will discuss that with the medical staff."

Rooney was dropped for Man United's Premier League clash with Leicester City last weekend, which the Red Devils won 4-1 in arguably their best performance of the season.