Twitter revels in awkward banter between Sean McDonough, Jon Gruden

NFL broadcaster and former Oakland Raiders head coach Jon Gruden greets fans before an NFL preseason football game between the Oakland Raiders and the Dallas Cowboys in Oakland Calif. Monday Aug. 13 2012

The announcement followed a week of reports that Gruden had agreed to take the job - and came just hours after Gruden called his last game for ESPN. "It'll be tough for a lot of us on the crew to be impartial when we go into those production meetings and see you next year".

It had been reported from a number of media outlets that Gruden would return as coach and receive a formal introduction Tuesday during a news conference.

"It's an emotional and bittersweet day for our "Monday Night Football" family as today we say goodbye to coach Jon Gruden after nine very distinguished years", McDonough said before the game.

Gruden is now beginning his second stint coaching the Raiders.

The Raiders fired Jack Del Rio following a 6-10 season as rumors team owner Mark Davis had targeted Gruden to replace Del Rio.

At the conclusion of ESPN's Titans-Chiefs broadcast, play-by-play announcer Sean McDonough congratulated Gruden and shook his hand.

Gruden reportedly will receive a 10-year contract worth $100 million.

Gruden spent his first four seasons as a head coach with Oakland, posting a 38-26 record from 1998-2001 and guiding the team to a pair of playoff berths, including the AFC Championship game in his last two seasons. He led the Buccaneers to the Super Bowl title over Oakland the following season.