Walker Injury Shows Boro's Bad Luck!
The 19-year-old was substituted early in the second half against Sunderland with ankle ligament damage.
It's a blow for Walker, and for Boro, who have now gone nine Premiership games without a win.
Southgate: "Josh was hurt in the challenge by Malbranque in the opening minutes.
"It was not so much the tackle, but he went over on the ankle at the same time.
"He thought he could run it off during the game, but it flared up at the start of the second half.
"It's disappointing for Josh. We are still assessing the damage so we don't know how long he will be out at this stage."