Diehl was injured on Sunday in the Giants' 41-34 thriller of a win against Greg Schiano's Tamba Bay Buccaneers. Head coach Tom Couhglin said Diehl went through a few different tests including an MRI.
When asked to confirm that the MRI had been taken, Coughlin was able to on Monday.
"That’s the part I do know, but I don’t know the extent and hopefully that’s it," Coughlin said. "I can't tell you anything more than what you are asking me. There’s an MCL, don’t know anything more, and I’m not going to be able to comment on anything else about the knee."
Losing Diehl for any extended amount of time would obviously be a blow to Big Blue. New York can shuffle the line if need be, with Will Beatty moving to left tackle while Sean Locklear fills in for Diehl.
"I’m sure there’s some rust there for Beatty, but I think it was a good experience to get him back in there," Coughlin said. "He played probably more than we anticipated, but seemed to respond well."