Maurice Jones-Drew: Warning To NFL Players ... WEAR SHOWER SANDALS (VIDEO)

Former NFL stud Maurice Jones-Drew is no longer dropping linebackers on the field ... but he's still dropping jewels to the young players ... this time on the importance of proper shower apparel.

Maurice was leaving Greystone in L.A. when we asked him about ATL Falcons rookie RB Tevin Coleman ... who missed Sunday's game with concussion symptoms ... after slipping in the shower.

Check out the clip -- MJD couldn't have been more clear ... if you're gonna be a world class athlete making millions of dollars ... pony up a couple bucks for some wash time traction.