I could of swore I read somewhere that while he avoided a major injury, it could potentially be a high ankle sprain... if so, those can take some time to recover from.
Either way, next week could be tough, with the Lions loading up on their linemen, coming off a bye week, and their only loss being to the very high powered Chiefs offense (and giving up a big lead which lead to a tied game in the opener against the Cardinals).
But the only game in common is the Eagles, which the Lions beat and the Packers lost to.