"This was a dream (come) true", Irvin told ESPN's Vaughn McClure after news of his signing broke.
He has three sacks this season after posting a career-high eight sacks last season. Irvin has 3.0 sacks so far on the year and will be joining a much better defense in Atlanta. Atlanta, meanwhile, has 17 sacks this season, tied for fifth-fewest in the league.
The Falcons (4-4) are slated to visit the Browns (2-6-1) at 1 p.m. ET Sunday.
Irvin is also reunited with Dan Quinn, who was previously the Seattle Seahawks defensive coordinator in 2013 and 2014. Irvin, who is an outside linebacker is also an effective pass rusher. Irvin is a competitor, so being gifted the opportunity to join a team which will utilize his skill set and is looking to contend is a huge win for him. But the Falcons have won three in a row since then and still have the talent to get back in the wild-card race.