Welker made the announcement on Twitter. He said he loves the game and his teammates and "hopefully doing the right thing gets the right results."
A four-time Pro Bowl selection, Welker led the NFL with 122 receptions and was second in the league with 1,569 yards receiving. Welker, 30, is only the second receiver to catch at least 120 passes in two different seasons.
The team had nothing to announce on Tuesday.