The NFL admitted that officials made mistakes on three calls that went against the Titans in a 22-14 loss to the Colts, coach Mike Munchak said Monday.

The first occurred in the first quarter, when it was ruled that tight end Delanie Walker did not make a reception on what appeared to be a solid gain over middle. Officials at the time told Munchak that Walker bobbled the ball prior to falling to the ground and losing the ball.

The play stood up under review, so the Titans lost a timeout. They wound up scoring a touchdown on the drive, however.

The second wrong call occurred at the end of the first half, when middle linebacker Moise Fokou was flagged for a 15-yard unnecessary roughness penalty after he shoved Colts fullback Stanley Havili in the back.

The penalty pushed the Colts to the Tennessee 19 and they kicked a 37-yard field goal as time expired.

Munchak said the league told him that Fokou should only have been whistled for a 5-yard illegal contact penalty. If the correct call had been made, the best-case scenario for the Colts would have been a 52-yard field goal attempt.

Still, Munchak said Fokou didn't need to be as physical as he was with Havili.

"We don't want that behavior," he said. "He can play that smarter than he did."

The third wrong call occurred early in the third quarter, when running back Shonn Greene was whistled for a 15-yard unsportsmanlike conduct penalty. Greene clapped his hands repeatedly in the face of Colts safety LaRon Landry, adding a few verbal jabs, following an 8-yard run.

The league said, "there was no reason to throw a flag," Munchak said. "They both made a great play -- a great run, a great hit, and they get up and go. No one hit each other or pushed each other."

Need tight end, fullback: The Titans may well be in the market for a fullback and a tight end this week.

If they could find one player to fill both roles, that would be even better.

Fullback Collin Mooney was lost to a knee injury during Sunday's game against the Colts, and it's possible he could miss the rest of the season. Mooney was seen after the game with a brace on his knee and using crutches.

"We couldn't run the goal-line, we couldn't run a lot of things because we didn't have a fullback or a tight end," Munchak said. "We'll definitely have a fullback on the roster."

The Titans went into the game down one tight end, as Craig Stevens sat out with a concussion. Then in the first quarter, Walker suffered a concussion and missed the rest of the game.

Munchak said Stevens worked out Monday and could return to practice this week. Walker's status was to be determined.

Locker speaks: Quarterback Jake Locker addressed media Monday for the first time since undergoing foot surgery for his Lisfranc injury on Nov. 20.

Locker, who was wearing a cast and using crutches, confirmed that he likely has five or six months of rehabilitation ahead of him.

"I think that I'd be able to go by minicamp, and (training camp) for sure," he said.

Locker said the cast comes off later this week, but "as far as running or doing anything on my feet, that's a little ways away."

He said he was told the surgery went well.

Time change: Kickoff time for the Dec. 15 game against the Cardinals has been moved from noon to 3:25 p.m.