However, in 2002, dressed as an assistant coach for the Philippine National Basketball Team, and Gregorio was named as the interim coach of the TJ Hotdogs. Under Gregorio's hands, Purefoods won the 2002 Governor's Cup with a 4-3 series victory over the Alaska Aces. The team was led by imports Derrick Brown, Kelvin Price and Best Player of the Conference winner Rey Evangelista. Gregorio coached the team to a dismal performance in the Commissioner's Cup before Altamirano regained coaching duties in the All-Filipino Cup. Despite this, Gregorio was rewarded, along with then-Coca-Cola Tigers mentor Chot Reyes as co-winner of the PBA Press Corps Coach of the Year Award.