Manchester United manager Jose Mourinho admits striker Romelu Lukaku is "tired" but says he cannot afford to rest him.
The 24-year-old has played every minute of his club's English Premier League campaign so far because of the injury problems of fellow striker Zlatan Ibrahimovic.
Lukaku started the season with 11 goals in 10 games, but has only scored four times in his last 19 outings.
Mourinho says Lukaku is fantastic for him but he cannot rest him
Manchester United will play Southampton at 6.30am tomorrow in the English Premier League.
