Denver veteran wide receiver Wes Welker joined his Broncos teammates on the practice field on Monday, a good sign that he avoided a long-term setback from a concussion.

Multiple reports said Welker still need to be cleared for contact tough.

He suffered his third concussion in less than a year when he was hit by D.J. Swearinger during a preseason game against the Houston Texans. The hit angered quarterback Peyton Manning, who was penalized and fined by the league for taunting the safety after a touchdown pass on the subsequent play.

Welker still needs to be cleared by doctors before he can play in the season opener against the Indianapolis Colts.

"He's still in the [post-concussion] protocol. He's still exercising," head coach John Fox said Monday afternoon. "We feel good about his progress."

Fox reiterated that the team will be cautious when it comes to letting Welker play. Last season, Welker missed only one week after suffering the first concussion in November against Kansas City. Three weeks later, he suffered his second concussion.