Ruben Amorim has told Kobbie Mainoo he still has room for improvement as the Manchester United midfielder prepares to make his comeback from injury.
Mainoo has been included in United's squad for the Europa League quarter-final clash with Lyon in France on Thursday night following a nine-week absence, although Amorim says he will be careful with the teenager.
But United's head coach believes he owes it to Mainoo to challenge him to become a better player and find his best position despite already being an established England international.