It looks like Bengals defensive end Michael Johnson did in fact suffer an MCL sprain that will sideline him only a few weeks, according to ESPN's Josina Anderson:
#Bengals team source on Michael Johnson’s MCL strain injury they confirmed to me: "Mike will be good in a few weeks."— Josina Anderson (@JosinaAnderson) August 3, 2015
'Only' a few weeks is a lot better than an entire season. That's how bad the injury looked initially, but Johnson appears to have dodged a bullet.