"We'll see how (Robertson) responds," head coach Mike Pettine said. "We’ll have a much better idea on Wednesday."
Robertson suffered the injury in the second half of the Browns' Week 3 loss and was replaced in the starting lineup by Christian Kirksey.
Kirksey, the Browns' third-round pick in 2014, has primarily played as a nickel linebacker. It's not out of the question he'll remain in the base defense once Robertson is healthy.