Baltimore Ravens activate TE Darren Waller

The Baltimore Ravens activated tight end Darren Waller on Saturday from the commissioner exempt list to the 53-man roster after he served his four-game suspension for violating the NFL's substance-abuse policy.

Waller, a sixth-round pick in the 2015 draft out of Georgia Tech, has played in six career games, posting two receptions for 18 yards and registering three special teams tackles.

The Ravens had an open spot on their active roster after tight end Maxx Williams (knee) was placed on injured reserve Friday.