London Olympics Swimming MenRyan Lochte (AP Photo/Daniel Ochoa De Olza)

By Braden Keith, courtesy of SwimSwam.com

American swimming superstar Ryan Lochte has scratched out of the Charlotte Grand Prix this weekend, which was set to be his first as a member of the home team.

The news first broke with a Tweet from the USOC to a fan, who was waiting for an interview that they had produced with Lochte. Thus far, we have not received a response from SwimMAC coaches with more details.

Lochte pulled out of the last session of the Mesa Grand Prix last month with some tightness in his hamstring, as he continues to work his way back from an MCL Tear and ACL sprain late last year. He otherwise swam well in Mesa, but the long-term health of his knees, which he’s had several injuries to throughout his career, are of increasing concern for the 29-year old.

Images have shown Lochte wearing a small knee brace around Charlotte since returning home from the Mesa Grand Prix.

Watch the Arena Grand Prix at Charlotte, featuring Michael Phelps, May 16-17 at 6 PM ET LIVE on Universal Sports. CLICK HERE for more info.