A formal press conference announcing the retirement of Clinton Portis from the NFL is not due to be held for another 90 minutes or so.

However, the former Redskins running back has already taken to his Twitter account to say a more informal goodbye to professional football, and we're not going to lie, it's kind of moving.

Time to walk the green mile, spent half my life on the gridiron never figured i would get butterflies preparing to walk away

— Clinton Portis (@TheRealC_Portis) August 23, 2012

Thanks to all my fans, haters, friends, family and teammates. This game wouldn't have been the same w/o you all.

— Clinton Portis (@TheRealC_Portis) August 23, 2012

I still here the voices, not good enough, to small, bad attitude, injury prone, scat back, can't catch, not coach able , party animal

— Clinton Portis (@TheRealC_Portis) August 23, 2012

15 yrs later no arrest, no drugs, 9yrs in NFL, 2 pro bowls, over 50 TKO's, a couple dollars, 75TDS, why not now out gracefully 😘

— Clinton Portis (@TheRealC_Portis) August 23, 2012

Bless.