Does one of the greatest Kansas City Chiefs ever regret retiring just months before the team's best run in recent franchise history???
Tamba Hali tells TMZ Sports not one bit ...
"I think there were measures -- I could've did more about being on the team this year, but I'm happy for those guys."
Hali is a legend in K.C. ... having played the last 12 seasons there and racking up 89.5 sacks -- but he retired after last season having never gotten further than the Divisional Round of the playoffs.