I don’t see we need him in January (unless to have harmony with the team for next season)
He will not play in CL, and it will not be a good practice to play in Liga with a team different than CL
Surely he'd be ideal to get him in January - he can play in all the league and Spanish cup games - rest somebody else for the CL games ( maybe just 2 !) - he'd be good to go for the new upcoming season ..