The source, however, said the injury did not affect Coates' practice participation throughout the year and was more of a nuisance.
On Monday night, Coates tweeted his displeasure at undergoing surgery on his pelvis, then confirmed to inquiring fans that his surgery repaired a groin injury.
Coates was the #16 WR in PPR formats through the first five weeks, thanks in large part to his 6-139-2 outing against the Jets in Week 5. (He was the #44 WR through Week 4.) He then struggled with two broken fingers and apparently a groin injury for the remainder of the season, reeling in just two of 18 targets for 14 total yards. With Martavis Bryant likely to return in 2017, Coates will be in a reserve role for the Steelers.