Hatcher, who's coming off a career-high 11 sacks last season for the Cowboys, will undergo arthroscopic surgery on his left knee on Thursday. He's supposed to miss 4-6 weeks, meaning he might not be ready in time for the beginning of training camp.
"It's old stuff, man," Hatcher said, via the Washington Times. "I don't know a particular play, but I don't want to go into the season 80 percent. I want to be 100, so I can be the best Hatch for this football team, for this defense, so I can help our team get better."
Hatcher had participated in most of the team's OTAs this offseason, but he recently complained of pain and swelling. It wasn't clear when Hatcher hurt himself.
"We don't feel like it's a long-term thing," Redskins coach Jay Gruden said. "Any time you have a surgery there's a little bit of a concern. But I think from what I'm told, the severity of it is not that great…There was no major damage in there whatsoever."