Umtiti is a very good centre back especially for the start of the game. He is quite quick, very strong and a beast at defending. For the price of only 80k at the start of the game, he will surely last until at least December. In my opinion its a must do if you have a lot of fodder and you are running a French/LaLiga side.
Pace maybe but if you pair him alongside a faster defender you'll be alright
Clunky on the ball