Allan was a leader at Napoli and is highly regarded and respected by Ancelotti but language could be a barrier as from what I can tell he only speaks Italian and Portuguese. Holgate is a good shout but same issue as Allan. Gomes could be one also but I don't see him being played enough consistently to make it count.
While the Doncaster accent can be a bit weird, I'm pretty sure he'll be ok.
I don't think the language barrier is a huge deal any longer anyway. I want Hamez to have the #10 and the armband right now.