RENTON, Wash. -- George Fant went through his share of growing pains as a rookie, but the Seattle Seahawks left tackle was put in an impossible situation.

He hadn't played football since the eighth grade and was asked to start 10 games on a team trying to contend for a Super Bowl. Fant showed the coaches this offseason that he was serious about improving. He bulked up from 296 pounds to 320 pounds. He struck up a relationship with Hall of Famer Walter Jones and picked his brain. Pete Carroll singled Fant out as the Seahawks player who made the biggest jump since the end of last season.

But on Friday, Fant suffered a significant knee injury, and he's expected to miss the season. With the regular-season opener less than three weeks away, the Seahawks are scrambling to find a new left tackle. Here are their options.

Rees Odhiambo -- The second-year player will get the first shot at replacing Fant, but Odhiambo hasn't shown much since the Seahawks drafted him in the third round in 2016. The coaches deemed that he wasn't good enough to beat out Fant, Garry Gilliam or Bradley Sowell at either of the tackle spots last year. Until Fant's injury, Odhiambo was slated to serve a backup role.

"We drafted him highly with the thought that he’d be able to do this," Pete Carroll said. "I’ve never backed off the thought. Physically, he can do it all. Now, he’s just got to make sure he can settle in and execute and function really well with the guys."

Having Odhiambo step up to the challenge would be the Seahawks' best-case scenario. But at this point, to count on that happening would be a mistake.

Luke Joeckel -- It's clear now the Seahawks signed Joeckel with the intention of playing him at left guard. Joeckel started at left tackle during his first three seasons before sliding inside. He's gotten reps at tackle during camp but was penciled in as the starting guard, and Carroll would prefer not to move him.

"Luke has been a starting left tackle in the NFL. He was drafted as that, and if that’s what winds up happening, that winds up happening," Carroll said. "And we know that. We like Luke playing at left guard, and we’d like to keep it that way."

Carroll was pretty clear that they don't want Joeckel to move back to tackle, but this option can't be ruled out completely.

Ethan Pocic -- He's a dark horse. The second-round pick out of LSU played multiple spots in college but was mostly a center. He has been competing with Germain Ifedi at right tackle, but Carroll indicated on Monday that Ifedi is going to start. That could open up other options for Pocic.

"He’s played left tackle in the past," Carroll said. "He’s done everything. He’s already done a little bit of everything for us. That’s a possibility. He’s only played a short time there at the left side. He’s been primarily [a] right-side guy. When you’re a center, you have to be somewhat ambidextrous. That’s a possibility, also."

Pocic is 6-foot-6 with 33 1/8-inch arms. He figures to at least get a look at left tackle.

Matt Tobin -- The Seahawks acquired him from the Philadelphia Eagles on Monday. Tobin has started 21 games in four seasons. NFL Nation Eagles writer Tim McManus did not project Tobin making Philadelphia's 53-man roster. None of his career starts have come at left tackle, although Tobin has filled in there during games.

In the Eagles' last preseason game, Tobin played right tackle.

The Seahawks obviously brought him in for a reason. Tobin could assume the role of versatile backup, but he'll likely be given a chance to compete for the left-tackle job.