Diogo Dalot is expected to make his much-anticipated Manchester United debut in Wednesday’s opening Champions League fixture away to Young Boys.

The highly-rated 19-year-old right-back is due to start the match against the Swiss champions, having come through the full 90 minutes of an Under-23 fixture last Friday against Reading in which he proved he had fully overcome a knee injury.

The Portuguese Under-21 international joined United for £19 million from Porto in the summer and is expected to quickly provide competition for captain Antonio Valencia for the right-back berth – before becoming his long-term successor - although he can also play on the left flank. He has also played in midfield and is regarded as a good athlete as well as a technically gifted player.

Mourinho has already stated that Luke Shaw will also start against Young Boys which would indicate Valencia is going to be rested with Dalot appearing at right-back although Ashley Young could play there.

When he signed him Mourinho hailed Dalot as “the best full-back in Europe” for his age group. Dalot arrived at United having undergone surgery for a minor knee operation with the club not wanting to rush him back, partly because of his age, but even so he has returned to action ahead of schedule.