Sean McDonough is really going to miss his ESPN partner Jon Gruden on “Monday Night Football” and gave an awkward fist bump to prove it.

“Thank you, coach, as we wrap this one up, all of us last night in our production meeting got a chance to tell you what we think about you and how much you meant to us and to ‘Monday Night Football,’ ” McDonough said after the Titans’ 22-21 come-from-behind win over the Chiefs on Saturday. “What a great way to send you off. Appropriately so. Good luck with the Oakland Raiders.

“It’s going to be tough for a lot of us on this crew to be impartial when we go into these production meetings and see you next year. All right, Lisa … Suzy [Kolber] take it away.”

According to ESPN, Gruden’s deal is reportedly for 10 years and $100 million. It would be the longest contract for an NFL coach since the Cowboys gave Tom Landry a 10-year extension in 1964.

It had been a poorly kept secret in recent days Gruden was going to coach the Raiders, but McDonough really let the cat out of the bag.

“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. “Great legacy on ‘Monday Night Football,’ not only have you lived up to it, you enhanced it with your performance here.

“But I know you are looking forward to getting back to coaching. We congratulate you as you head back to the sidelines with the Raiders.”

Gruden seemed touched by the remarks but didn’t want to step on a future official announcement.

“Oh, thank you,” Gruden said. “Nothing’s official yet. These Chiefs fans have been on my case since I got here.”

But later in the night, the Raiders did make it “official.” The introductory press conference will be on Tuesday.