Jose Mourinho is revisiting his interest in Axel Witsel of Borussia Dortmund.

Mourinho told reporters on Friday that he had travelled to Brussels for the UEFA Nations League clash with Iceland in order to monitor Romelu Lukaku's fitness following a hamstring injury. 

Mourinho has been a long-term admirer of Witsel and had been keen to sign the former Benfica and Zenit St Petersburg player last summer.

United instead spent £52 million to sign Fred from Shakhtar Donetsk.