The 20-year-old was forced off with the issue early in the second half of the Premier League encounter at Anfield.
Speaking at his press conference to preview the second leg of Liverpool's Europa League quarter-final with Atalanta, Klopp said: "I think Ryan Gravenberch had a similar thing, so first week of May he [Bradley] should be back in training. When is that? Two weeks' time.
"[He] overstretched the ligaments, not serious-serious but serious enough that he's not here."
Asked if he had any other injury concerns, the boss replied: "No, all the others are fine."
