The Guinea international and Fabinho were brought in this summer, with the latter yet to make a competitive appearance. And James Milner, Gigi Wijnaldum, Jordan Henderson and Adam Lallana are also fighting for playing time.
"Competition for places in midfield is something that can only help the team," said Keita.
"Obviously the coach will go ahead and make his choices and I am sure he will choose the best players at the time for each match as they come along. That way, everybody gives their best throughout the season and I think it also gets the best out of everybody."