As we reported earlier today, the centre-back flew out to the Italian capital this morning to undertake a medical and finalise the contractual details.
Speaking to MUTV before his pre-match press conference, Ole Gunnar Solskjaer explained the reasons behind the temporary transfer.
“At the moment we've got six centre-backs,” said the manager.
“This is just something that popped up towards the end [of the European transfer window] in the last couple of days.
“Chris fancied the chance to go over there; it's a new experience, new adventure.
“He'll come back better for it because it's a big club, it's a good league.