The race to beat the clock is on for Giants fullback Henry Hynoski, who will undergo knee surgery today and hopes to be recovered in time for the Sept. 8 regular-season opener against the Cowboys.

Hynoski went down on the second play in Wednesday’s first organized team activity practice and was carted off the field holding his left knee. He needs surgery to repair a damaged medial collateral ligament and also to repair a chip fracture to his lateral plateau [tibia].

The Giants did not set a timetable for Hynoski’s return, but the fullback stated he has been told it is not unreasonable he could be ready for the start of the regular season, which is more than three months away.

“I am going to set my mind to being ready for the first game of the regular season,” Hynoski said. “They said that is not an unrealistic goal, and I will do everything in my power to be ready for the start of the season.”

Hynoski on his Twitter account wrote: “Just a bump in the road ... I will come back stronger than ever from this!’’

Hynoski’s surgery will be performed by team physician Dr. Russell Warren at the Hospital for Special Surgery.