Foster -- the Texans' leading rusher -- was pulled from Sunday's 23-6 loss to Minnesota with the irregular heartbeat, which Coach Gary Kubiak said had subsided by the game's end.
News of the episode prompted fearful fan speculation about Foster's health, but the star running back took to his Twitter account Monday to reassure fans he was healthy.
"I appreciate all the concern and support. I am doing well. Saw a cardiologist today and everything is back to normal," he wrote.
The message came after he issued a statement following Sunday's game indicating the irregular heartbeat was "a very minor situation."
"The tests on Arian look to be positive," Kubiak told the Houston Chronicle Monday. "We expect him to be back" for the AFC South champions' final game of the regular season against Indianapolis.