Your backroom staff will suggest any links if they are needed I would have thought though I've never seen any suggested with foreign players I've signed. The media always seem to ask the question of getting another player to help them settle should no one at the club speak the language already otherwise getting a player already there to lend a hand, and sometimes it works sometimes it doesn't. I've had foreign players I've signed come speak to me who complain they can't settle, and that bringing in a compatriot who speaks their language would help; others that say it would only make things worse.
I don't think anything you really do will have too much of an influence, they will simply pick up the language when they pick it up. Play them normally as you want without considering the language barrier, they might be a tiny bit less effective on the pitch as they gel in the squad, but nothing too noticable that it isn't worth blooding them and making them a part of your plans.