In 2021, the Lions traded quarterback Matthew Stafford to the Los Angeles Rams. Since then, he's served as the team's starting quarterback. However, the Super Bowl LV champion also dealt with several injury concerns.Ahead of his fifth season with the Rams, Stafford has been dealing with back discomfort over the past few days. This led to him missing out on Monday's practice session with the team.On Monday, ex-Packers quarterback Matt Hasselbeck spoke about Matthew Stafford's injury concern. During an appearance on 'The Colin Cowherd Show', he expressed his concerns about the quarterback's health and its impact on the Rams' 2025 season."I'm concerned about Stafford's back," Hasselbeck said. "I had a bad back injury in 2008. Usually you can tell how bad a quarterback's back injury is by if the team sends him to California to see Dr. Bob Watkins. If they do that, you know it's serious."But no I'm concerned. I'm definitely concerned if you take the factors of his age, all those types of things ... The closest thing I could equate it to, is if you burn your mouth on a hot piece of pizza, and it doesn't get better quick. And that's kind of what the back injury typically is ... Even if they do get better, you've missed all this time of like heavy weight training or physicality that goes into your offseason, and you're just not the version of yourself that you normally are. So I'd be very concerned if I was Rams fan right now."Last season, Matthew Stafford helped the Rams to a 10-7 campaign and finished 1st in the NFC West. They qualified for the playoffs but were unfortunately defeated by the Vikings in the wild-card round.What did Matthew Stafford do while missing Monday's practice?Instead of focusing on training, the veteran quarterback utilized Monday to focus on quick rehabilitation. According to a tweet by Rams beat writer Adam Grosbard, Stafford spent his time inside an 'Ammortal Chamber.'"Matthew Stafford walked into this Ammortal Chamber. Ammortal advertises itself as a 'wellness device that aims to optimize human performance and promote holistic health through a combination of non-invasive technologies.' He is not practicing today."Fans will hope that Stafford gets better ahead of the upcoming season. The Rams have a brutal schedule ahead, taking on teams like the Eagles, the 49ers and the Ravens this year.