Whitney Mercilus, Joe Flacco

The Houston Texans' Whitney Mercilus was flagged for this hit on Ravens quarterback Joe Flacco in the third quarter. (Lloyd Fox, Baltimore Sun / September 22, 2013)

Houston Texans outside linebacker Whitney Mercilus was fined $15,000 for his hit Sunday on Ravens quarterback Joe Flacco.

"Thank NFL for my first fine," Mercilus wrote on his official Twitter account. "Unfortunately I feel like it won't be my last as a pass rusher."

Mercilus was penalized for roughing the passer on a hit to Flacco's face during the third quarter of the Ravens' 30-9 win.

Flacco was unhurt, and the Ravens went on to finish the drive with a 1-yard touchdown run by running back Bernard Pierce.

Mercilus intends to appeal the fine.