Ravens fullback Vonta Leach and strong safety Bernard Pollard, who played with the Texans in 2010, already faced their former team once this season -- a 29-14 Ravens win back in Week 6.
There were no sentimental feelings then, Leach said, and there will be none in the postseason.
"After the game, [we're] going to still be friends," said Leach, a first-team All-Pro fullback who spent five seasons in Houston before signing here. "But between the whistles, we're enemies."
Pollard also said it will be business as usual Sunday, but he is proud of his former teammates.
"They've learned so much, learning from the losses and the seasons and making some changes," Pollard said. "They've always been at the door, banging. Banging. This year, they knocked that thing down. … [In the wild-card round] they played their butts off in front of their home crowd."