Fairly (knee) has been diagnosed with a sprained MCL/PCL and is expected to miss 4-5 weeks, ESPN reports. Fairly left Sunday's game against the Falcons with the knee injury, and Monday's MRI revealed the damage. Obviously losing Fairley is a tough blow for Detroit, but if all goes well, he should be back in the fold for the final few weeks of the regular season. Fairley has 14 tackles, one sack and one forced fumble this season.