Shortly after, Mowbray called for the cavalry, sending on a trio of attacking substitutes in the form of Bradley Dack, Dominic Samuel and Ben Gladwin.
But 20 minutes after being gifted an opener, Doncaster would go 2-0 up from the penalty spot. Rovers were carved open, allowing James Coppinger to run clear. Charlie Mulgrew tried his best to get back, only to be penalised for a foul on the midfielder, with the referee pointing to the spot after plenty of consideration.
But it was definitely too little, and certainly too late.
Things were to get worse for Rovers though as they conceded a calamitous third. Raya raced off his line to try and deal with a long ball over the top. However, his attempted header towards Elliott Ward could only find Alfie May who had the simple task of rolling in to the empty net.
Slow and lethargic in the first half, Rovers would have been looking for a response after the break, only to then be chasing the game within a minute of the re-start as they fell behind, before more defensive lapses saw Doncaster go out of sight.
Boss Tony Mowbray has a wealth of options as his disposal, as shown by the substitutes bench he was able to name, but is still searching for a way in which to mould them in to a team.
After two defeats in their opening two games, they need to try and find a formula, and balance, to their play that will allow them to be expansive enough to create the chances they need to win games, while remaining resolute enough in defence to keep the back door shut.