Matthews sustained a "chip fracture" in his sternum during his first practice with the club, according to an official announcement made by the Bills on Monday.
This obviously isn't the way Buffalo hoped the Matthews era would get going. After removing Sammy Watkins from the equation, Tyrod Taylor now has to operate with rookie Zay Jones, veteran Anquan Boldin and a slew of wideouts competing for playing time behind them. Matthews will have to learn the offense from the sideline.
This was never going to be a high-flying attack in Buffalo this year. Clearly, the Bills are setting up the chess board for 2018 and beyond, but in the meantime are certainly putting plenty of pressure on Taylor to be the best quarterback he can be.
Here is the other injury news we are tracking on Monday:
Rookie running back Leonard Fournette was held out of practice again on Monday. Fournette is dealing with a nagging foot injury and coach Doug Marrone said Sunday the team is exercising caution and not rushing a return. Both Lee and Fournette will likely not play in Thursday's game against the Buccaneers, Marrone said Monday.
- Cowboys linebacker Justin Durant (elbow) passed his physical and is expected to participate in practice Monday afternoon, the team announced.