Green Bay, Wis. ? Troy Aikman says it’s a sure thing: Brett Favre will have second thoughts about hanging up his helmet.

The Hall of Fame quarterback knows how hard it is to walk away from the NFL and never look back. Even after a series of concussions led Aikman to retire from the Dallas Cowboys after the 2000 season, he was tempted to come back two years later.

“I was ready to go and had talked with my wife and everything about it,” Aikman told the Associated Press by phone.

Aikman figures Favre will feel the same pull the closer the 2008 season gets. And he wouldn’t be surprised if Favre changes his mind and sends heir apparent Aaron Rodgers back to the bench.

“You want to walk out on top,” said Aikman, now an analyst for Fox Sports. “But at the same time, you’re walking away from something you really enjoy.”

Favre told the Green Bay Packers he was retiring Tuesday, but hasn’t addressed the media beyond a brief voice mail to ESPN’s Chris Mortensen, citing fatigue. Favre is to discuss his decision at a news conference today in Green Bay.

Aikman is looking forward to hearing the three-time MVP fully explain his decision. He wonders if Favre will give himself any wiggle room, similar to Michael Jordan’s famous assertion that he was “99.9 percent” sure he was done playing after retiring from the Chicago Bulls in 1999. Jordan, of course, came back to play for the Washington Wizards.

Aikman isn’t the only one who expects Favre to question his decision.

“I think he’ll definitely have second thoughts, knowing him,” former Green Bay Packers coach Mike Sherman said. “He’s a creature of habit.”

Favre even broached the subject in his conversations with Packers coach Mike McCarthy on Monday night, when he first brought up his intention to retire.

“We talked about the reality that he’ll experience,” McCarthy said. “And he was telling me about the conversation he’d shared with a family member about when the games start in the fall, it’s going to probably hit him the hardest.”