If he's 'regularly taking the piss in training' given he's vs'ing 1st teamers - and taking Fred on in that clip - there's little reason for him to not be considered a viable option. Question, however, is where on the pitch? He's obviously not going to start ahead of Pogba or Bruno - if he's doing well from deeper in training, however, then giving him playing time, particularly in games we've got a big lead in going into the last 10-15 of regular time, must surely be viable.
I asked previously how he's doing for his NT and got no answer, but isn't that the best barometer of his readiness to handle the men's game? Is he being manhandled or rendered toothless due to his strength, or lack thereof, for his NT?