Under Armour (NYSE: UA) is slightly negative in early trading amid news that the company landed an endorsement deal with a top NFL quarterback.

The NY Post said late Thursday that Under Armour signed Tony Romo of the Dallas Cowboys to an endorsement contract.

Commenting on the news, Under Armour said, Tony Romo is one of the most respected and accomplished athletes in the NFL.

Under Armour also sponsors Tom Brady of the New England Patriots and Cam Newton of the Carolina Panthers.

Romo was previously sponsored by Nike (NYSE: NKE).