Anderson apologized to Cleveland fans Wednesday after calling them "ruthless" and adding that they "don't deserve a winner" following his release by the team.
What's next for Anderson?
"The fans are ruthless and don't deserve a winner," Anderson wrote. "I will never forget getting cheered when I was injured. I know at times I wasn't great. I hope and pray I'm playing when my team comes to town and (we) roll them."
On Wednesday, Anderson sent an e-mail to Cleveland media members saying he regrets some of his comments.
"Those of you who got to know me personally from covering the Browns over the past five years, know this was out of character for me," Anderson said. "I wasn't taken out of context, but I was speaking out of frustration after my career with the Browns came to a close. I had some great times playing in Cleveland, especially during the 2007 season, and I met some great people and made many lifelong friends along the way. I'm looking forward to starting a new chapter in my life."
Anderson threw 29 touchdown passes in 2007 and led the Browns to a 10-6 record. However, his promising career has been in a tailspin ever since. He lost his starting job to Quinn at the start of last season, got it back, lost it again, and then returned to the starting lineup when Quinn was injured and helped win Cleveland's last two games.
"I want to thank Derek for everything that he gave to the Cleveland Browns organization over the last five years," coach Eric Mangini said in a statement released by the team Tuesday. "He did everything we asked of him, and it was a pleasure to coach such a competitive person. I want to wish him all the best in the future."
Anderson's passer rating was an abysmal 42.1 last season, and the Browns went 3-4 with him in the starting lineup. But despite his struggles and constant criticism from Cleveland fans who preferred Quinn, Anderson never complained and remained one of the team's leaders.
After Quinn sustained a season-ending foot injury on Dec. 20, Anderson started and helped Cleveland win its final two games. The team finished the season with a four-game winning streak -- a spurt that likely saved Mangini's job.
It's still unclear what direction the Browns will go at quarterback. Quinn hasn't lived up to expectations, and Wallace, who worked with new Browns president Mike Holmgren with the Seahawks, might not be ready to start. Holmgren said last week that the team was actively looking for a quarterback, but he didn't specify if that meant in free agency or via trade.
The Browns also have 11 picks in April's draft, and it's possible they could use one to groom a starter.
The Associated Press contributed to this report.