There aren't many 25 year olds that have to compete for a place with a world class striker. He needs more time ( see Ndombele).Any player can look good against the embarrassingly bad opponents we’ve had in the Europa League. He’s had a few nice moments but that‘s it. He’s been hooked early a couple of times even in those low level matches.
He has played just 12 minutes in the PL which is a really worrying sign, Mourinho clearly hasn’t been impressed. I doubt there have been many 25 year old strikers who have made so little impact in the PL and gone on to turn it around. He literally never plays.