Peyton Manning got through the weekend thanks to hundreds of texts and calls from men he played against or alongside over his unparalleled 18-year NFL career. He had to crack a few jokes to help fight back the tears at his retirement news conference Monday, when the words didn't always come as easy as the emotions. His voice cracking, especially when he mentioned his hero, Johnny Unitas, Manning said goodbye to the game he loved in an auditorium packed with friends, family and laughter. Manning, who turns 40 this month, said the timing was simply right to call one last audible one month after winning his second Super Bowl trophy. "I thought about it a lot, prayed about it a lot ... it was just the right time," Manning said. "I don't throw as good as I used to, don't run as good as I used to, but I have always had good timing." Manning came to Denver on March 20, 2012, for the chance to win another title in the twilight of his career. General manager John Elway had the blueprints. Four years later, he hobbles away a champion, just like his boss did 17 years ago. Manning is going golfing later this week with brothers Cooper and Eli — whose trip to Denver Monday morning was scuttled by a stomach bug. Manning plans to travel to Indianapolis later this month for a lower-key goodbye, nothing like this one, and said he'll still participate in his family's annual passing academy this summer. Aside from that, it's anybody's guess. Maybe a front office or a broadcast booth beckons. He hasn't ruled out anything other than this: he and his wife and 5-year-old twins won't be moving out of Denver. They love it here. "I'm totally convinced that the end of my football career is just the beginning of something I haven't even discovered yet," Manning said. "Life is not shrinking for me; it's morphing into a whole new world of possibilities." Monday wasn't a day to ahead but a time to take stock. "When I look back on my NFL career, I'll know without a doubt that I gave everything I had to help my teams walk away with a win," Manning said. "There were other players who were more talented, but there was no one could out-prepare me, and because of that I have no regrets." Elway thanked Manning for coming to Colorado, saying he made his own job easier, noting that with Manning living here, free agents were basically asking Elway "where do I sign?" It was through the eyes of a former QB and not those of a GM that Elway really enjoyed watching Manning, however. "Peyton Manning revolutionized the game," Elway said. "We all used to think a no-huddle was a fast pace, get to the line of scrimmage and get people off-balance. Peyton revolutionized it, and you know what, we're going to get to the line of scrimmage, take our time, I'm going to find out what you're doing and then I'm going to pick you apart. "I can't tell you how many times I said, ‘Dang, why didn't we think of that?'" Manning went 50-15 in Denver, leading the Broncos to four AFC West titles, two Super Bowl trips, one championship, and in 2013 guided the highest-scoring offense in league history. All after retraining himself to throw following a series of neck fusion surgeries forced him to miss the 2011 season and he was cut by the Colts. Manning revealed last summer he still had no feeling in the fingertips of his right hand, and yet he threw 140 of his NFL-best 539 TD passes for the Broncos, including a record 55 in 2013. Team president Joe Ellis told Manning, "If there is a list of achievements needed to attain greatness, you've checked every box." He informed Elway, Kubiak and Ellis of his decision to retire Saturday. Manning also called each of the other coaches he played for: Jim Mora, Tony Dungy, Jim Caldwell and John Fox. Then, he group-texted some former teammates with the Colts and Broncos, his high school buddies and his college pals. He texted coaches he played against, telling them all they'd been a part of his football life. All of the responses and conversations "kind of helped me through the last day and a-half," Manning said. Probe of HGH claim ‘ongoing' Peyton Manning walked away from the National Football League as he announced his retirement Monday, but the NFL is not yet done with its investigation into allegations tying him to human growth hormone. The NFL is reviewing allegations made in an Al-Jazeera report from December that said Manning's wife received deliveries of HGH, which is banned by the NFL, at their home while he was recovering from neck surgery in 2011. "The review is ongoing and comprehensive," NFL spokesman Brian McCarthy wrote in an e-mail. "It involves obtaining and reviewing numerous records, conducting multiple interviews and working with other entities. We do not comment on the specifics of these matters until the review is completed." Another off-field matter is also dogging the 39-year-old Manning who last month won a Super Bowl with the Denver Broncos. He was among athletes cited in a lawsuit filed by a group of former female students who are suing the University of Tennessee over its handling of sexual assault complaints made against student-athletes. — Agencies