Good player, but very weak mentally. He is talented, but he is a Balotelli 2.0. Keita is not the player Juve would be after, if he won't come very cheap.
If he goes to Inter, then at the end of the next season you will be all thank to Marotta to did not signed him this summer. He is not a team player and very lazy to track back and help the team out defensively, even Immobile tracked back, when Lazio lost the ball. I know he had a great season and scored a lot of goals, but so did Bellotti and he is just a rich man's Immobile.