(CNN) -- The Philadelphia Eagles welcomed Michael Vick back into the National Football League on Friday after the quarterback spent almost two years in federal prison on a felony dogfighting conviction.



Michael Vick speaks at a Philadelphia Eagles news  conference on Friday.



Vick, formerly with the Atlanta Falcons, has signed a two-year deal with the Eagles.



"I think everybody deserves a second chance," Vick said at a news conference in Philadelphia, Pennsylvania, on Friday. "Now I want to be part of the solution and not the problem."



The league suspended Vick indefinitely in August 2007 after he pleaded guilty to a federal charge of bankrolling a dogfighting operation at a home he owned in Virginia.



Vick, 29, was freed from federal prison at Leavenworth, Kansas, on May 20 and returned to his Virginia home to serve the last two months of his 23-month sentence in home confinement. iReport.com: Is this a good move?



"Everything that happened at that point in my life was wrong," Vick said of his involvement with the dogfighting ring.  Watch bloggers discuss Vick's return to the NFL »



"I had to reach a turning point. Prison definitely did it for me," he said.



Flanked by Eagles coach Andy Reid and former NFL coach Tony Dungy, who acted as a mentor to Vick after he was imprisoned, the newest Eagle vowed "to do all the right things."



"I want to be an ambassador to the NFL and the community," he said. "I'm glad I got ... a second chance. I won't disappoint."



Dungy said that he thinks Vick can revive his career and turn his life around in Philadelphia but that the quarterback will be tested by fickle Eagles fans.



"He is gonna have a lot of people who do not think he should be playing. He's got to prove them wrong on the field and off the field," Dungy said.  Watch why Dungy thinks Vick will be a positive force »



Earlier reaction to Vick's signing was mixed.



The Pennsylvania Society for the Prevention of Cruelty to Animals said Thursday night in a statement that it was "incredibly disappointed" at the news.



"Philadelphia is a city of dog lovers and, most particularly, pit bull lovers," said Susan Cosby, the organization's chief executive officer. "To root for someone who participated in the hanging, drowning, electrocution and shooting of dogs will be impossible for many, no matter how much we would all like to see the Eagles go all the way."



However, Ed Sayres, president and CEO of the American Society for the Prevention of Cruelty to Animals, said in a statement that "[NFL] Commissioner Roger Goodell and the Philadelphia Eagles have granted Michael Vick a second chance, and the ASPCA expects Mr. Vick to express remorse for his actions, as well as display more compassion and sound judgment this time around than he did during his previous tenure with the NFL.



"We hope that Mr. Vick uses his stature for the betterment of the community and the advancement of the issue of animal cruelty," Sayres said.



Reid said he knows that there are some fans who will not accept Vick.



"I understand how that works," he said. "But there's enough of them that will, and then it's up to Michael to prove that that change has taken place. I think he's there. That's what he wants to do."



He said Vick "seems very focused, and he wants to get his career back on track."



It is unclear what role Vick will play in the Eagles' offense. But it was clear that the move had the blessing of Eagles starting quarterback Donovan McNabb.



"I pretty much lobbied to get him here," McNabb said. "Because everybody deserves a second chance."



The NFL reinstated Vick on a conditional basis last month. Vick "will be considered for full reinstatement and to play in regular-season games by Week 6 based on the progress
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August 2007 National Football League felony dogfighting conviction. August 2007 Vick Andy Reid in regular-season games by Week 6
question: when was Vick suspended?, answer: August 2007 | question: what is the NFL, answer: National Football League | question: Did Vick have any charges against him?, answer: felony dogfighting conviction. | question: When did Vick plead guilty in dogfighting case, answer: August 2007 | question: who was suspended, answer: Vick | question: who is Eagles head coach?, answer: Andy Reid | question: when will Vick play, answer: in regular-season games by Week 6