But he was wearing a walking boot Monday, walking with a noticeable limp.

WSJ: Bulls without injured Hinrich in Game 5 Monday

Gronkowski, who has been in a walking boot, hasn't spoken with the media since the night of the win over the Ravens.

WSJ: An NFL Season Hinges on Rob Gronkowski's Ankle

Now the Yankee relief ace is on crutches, in a walking boot, and the Yankees are worried that he may have sustained a serious injury.

WSJ: Yankee Reliever David Robertson Injured in Fall

Yankees GM Brian Cashman was out of his walking boot.

WSJ: Yankees' Pettitte struggles against Astros