I can't help thinking we're making excuses here! Personally I've lost patience (lump in Lamela too).They both had a few injuries, 4 months is a short time really, they have to get use to the league, the culture. I don't think either of them speak great english.
Jose said it will take time as did his predecessor. I think we need to be patient
Aguero barely speaks English but seems to be doing well enough.
Ndombele has Lloris, Sissoko expats. Vertonghen and Alderweireld will also speak French.
Lo Celso has Foyth, Lamela, Sanchez and the remnants of Pochetino's Argentinian mafia who are still at the club. Almost certainly Lucas and Dier will have Spanish ability. They'll get offered language and cultural lessons, and translators for tactics and training.
4 months is plenty to learn each others names!
There's not much we can do about injuries but they're on 100K a week and we need them performing week in week out. Ndombele has had four months to get fit which is plenty, and yet struggles past 60 minutes.
No excuses!
Both should start today (but they won't!)