Alabama linebacker Terrell Lewis appears to be in great spirits after suffering a serious knee injury that is expected to keep him on the shelf for much — if not, all — of the regular season this fall.

Here's what Lewis said Tuesday on Twitter after Alabama coach Nick Saban announced his injury:

"Surgery went well! I appreciate all the well wishes & support! God has something for me on the other side that is greater than what I can see right now. So please don’t feel sorry me & my situation, I’m a warrior. What God has in store for me can’t be denied. Thank you to all!"

Lewis had a productive offseason for the Crimson Tide and was expected to start at one of the outside linebacker spots. One of Alabama's more versatile defenders, Lewis was to be utilized in pass-rushing situations as well.

"He underwent successful surgery today, and a timeframe for his return is unknown at this time," Saban said Tuesday in a prepared statement.

Former Alabama linebacker Shaun Dion Hamilton, who fought through multiple knee injuries in Tuscaloosa, tweeted words of encouragement to Lewis, who appreciated the gesture.

"Tough times don’t last forever but tough people do," Hamilton said.

Lewis missed 10 games last season after suffering an elbow injury against Florida State in the Tide's 2017 season opener. He finished the campaign seeing time in four games with one start, totaling 16 tackles, including two for loss, one sack and a pass breakup as a sophomore.

Finally healthy this spring, the former 4-star recruit participated in all of Alabama's 15 practices, including the A-Day Game, where he registered one tackle. Despite his low totals, he felt good about his spring campaign and was entering a junior season that could be his last in Tuscaloosa, Ala. -- because of his projected NFL potential in a year's time.

"I feel like I haven"t scratched the surface yet," Lewis said this spring. "I still feel like I haven't done a lot for this program yet, so I feel like the best is yet to come."

Alabama fought through a rash of injuries last season at linebacker to win its fifth national championship since 2009. The Crimson Tide on Monday dismissed reserve inside linebacker VanDarius Cowan after he was arrested on third-degree assault charges for his role in an altercation at a Tuscaloosa bar in June.

Alabama welcomes back on a couple starters off a defense that ranked No. 1 nationally in 2017 in yards allowed per game and scoring defense. The Crimson Tide gave up just 18 touchdowns all season, the lowest total since the 2011 squad.

The preseason favorite to win it all again, Alabama opens fall camp in a few weeks in prep for its opener against Louisville on Sept. 1 in Orlando. According to latest lines, Alabama is a 25.5-point favorite in the game.