The full-back felt the force of an aerial challenge with Myles Weston in the second half of our thrilling 4-3 win in the FA Cup fourth round.
Kieran got to his feet after treatment and tried to continue but was clearly struggling and limped out of the action on 73 minutes.
That left us with 10 men after making three substitutions but we clawed our way back from going 3-2 down on 83 minutes as goals from Dele Alli and Heung-Min Son saw us home.
Mauricio said: "Kieran got a knock to his hip and we will assess him tomorrow. We hope it’s not a big issue."