He's slated to miss multiple games, but it seems he could realistically return later on in the season.
Willson underwent arthroscopic surgery on his right knee Tuesday.
Willson (knee - MCL) responded well to surgery and is hopeful to return this season, ESPN's Liz Mathews reports.
Willson injured his knee Sunday against the Falcons and went under the knife Tuesday in order to fix it.
While he only has six catches and 12 targets through five weeks, Willson is an important part of a Seattle offense as a blocker, typically playing more than half of the snaps.
If the injury is serious, the will turn to veteran journeyman Brandon Williams and/or third-round rookie Nick Vannett in the No. Neither would threaten the workload of Jimmy Graham, who caught exactly six passes on either eight or nine targets in each of the past three games.
In his absence, Jimmy Graham will continue to start, but reserve tight ends Brandon Williams and Nick Vannett are candidates for increased usage.
Willson (knee) may require surgery, Seattle reports. Got a little cartilage damage in there and stretched ligaments and MCL, so we've got to figure out what that's going to be like," said head coach Pete Carroll.
needs an MRI and additional testing on the knee injury he suffered during Sunday's loss to the Falcons, Liz Mathews of 710 ESPN Seattle reports.Willson had to exit Sunday's game and was unable to return, finishing with one catch for nine yards on his lone target.