INDIANAPOLIS -- Indianapolis Colts linebacker Robert Mathis' locker was nice and neat Monday.

That’s the way it’ll stay for the next four weeks while he serves his four-game suspension for violating the NFL's policy on performance-enhancing drugs.

But Mathis didn’t go away without leaving a message for his teammates first:

Colts players just have to look at @RobertMathis98's locker if they need a reminder of things pic.twitter.com/zs60elLxsz

— Mike Wells (@MikeWellsNFL) September 1, 2014

Mathis wasn’t done.

He had another message that read:

This probably isn't a good time for Charles and Kenny to bring up fishing. The sign in Robert Mathis' locker pic.twitter.com/oftAYfUWTf

— Mike Wells (@MikeWellsNFL) September 1, 2014

The NFL sack leader last season can return to the facility on Sept. 22. His first game will be Oct. 5 against the Baltimore Ravens.