On the next play, Manning threw a touchdown pass and then received a taunting penalty after running down the field to confront Swearinger.
Welker now has to pass a neurological exam before being allowed to return to the field.
He was forced to miss the final three games of the season, but returned for Denver's three playoff games.
Welker, 33, had 73 catches for 778 yards and 10 touchdowns in 2013.
- Ben Estes