In 2005, he dressed in a total of 17 regular season games and 1 playoff game as a backup defensive back and special teams player, recording 19 special teams tackles in the regular season. In 2006, he dressed in all 18 games and recorded 18 special teams tackles. He played in both playoff games, including the successful Western Semi-Final win over the Calgary Stampeders. In 2007, Cherniawski suffered a knee injury versus the BC Lions and missed 6 regular season games. On November 25, 2007, Cherniawski was part of the winning team at the 95th Grey Cup in Toronto, Ontario, winning 23-19 over the Winnipeg Blue Bombers.
Cherniawski played for the UBC Thunderbirds from 2002-2004. In 2004, he was selected as a Canada-West All-Star, 2nd Team All-Canadian, and played in the East vs West All-Star game in Windsor, Ontario. He graduated from UBC with a degree in commerce.