Scrum-half Bruce was found in his hotel room the morning after playing for Batley in a defeat at Toulouse on Saturday.
French authorities are carrying out enquiries following the 20-year-old's death, while the Bulldogs confirmed the squad's return home had been delayed.
"We are devastated to announce the passing of our young player Archie Bruce, who was found in his hotel bedroom early this morning, having made his debut against Toulouse yesterday evening," Batley tweeted.
