Manchester United scouts were active in Germany on the weekend.
The Manchester Evening News says United sent scouts to watch two Borussia Dortmund players as they beat FC Koln over the weekend.
Man Utd scouts were in attendance to check on the progress of Julian Weigl and Christian Pulisic.
Michael Carrick has already announced that he will be hanging his boots up at the end of the season so Mourinho has began the search for his replacement.