Depending on the nature of the injury, Johnson, one of the top 30 prospects in the nation, could miss as few as two months or in the worst case his entire freshman season.
"It could either be a couple of months or it could be he'll miss the year," Pitino said. "If it's an ACL, he'll miss the year. The doctors don't know because they can't tell until they go in there."
"Surgery wise, that's going to happen next week," Pitino continued. "The Washington Wizards doctor is going to do the surgery in Washington D.C."
It's believed that Johnson hurt the knee during warm-ups of Oak Hill's last game, though Pitino indicated it was possibly something the player dealt with for the better of his senior season.
"He really didn't hurt it, it just felt funny," Pitino explained. "He could have actually been playing with it [injured] the entire year."
Should Johnson have an ACL and forced to sit next season, it would be the second hit to the Louisville frontcourt this week. 6'7 forward Donta Smith announced yesterday that he's entered the NBA Draft.