Brett Favre says that opting against playing for the Vikings this season was the hardest decision he's ever made. "It was the hardest decision I've ever made," Favre told ESPN's Ed Werder. "I didn't feel like physically I could play at a level that was acceptable. I would like to thank everyone, including the Packers, Jets and Vikings -- but, most importantly, the fans." He added that he is unlikely to ever consider playing in the NFL again. "I had to be careful not to commit for the wrong reasons," Favre said. "They were telling me, 'You went through all this, you had the surgery and you've got to finish it off.' But I have legitimate reasons for my decision. I'm 39 with a lot of sacks to my name."