Torpey must sit out three games after being sent off for confronting Rovers midfielder James Coppinger during Saturday's game, which meant he spent less than 10 minutes on the pitch after replacing Billy Sharp.
Laws has fined the player, who has issued an apology through the club, and raised questions over his future at the club.
With Sharp and Andy Keogh also one booking away from a one-game ban, BBC Radio Humberside report that a loan striker is wanted to provide cover.
United captain Andy Crosby sits out the next two matches after collecting 10 bookings this season, while Peter Beagrie, Cliff Byrne, Cleveland Taylor and Jim Goodwin are also one yellow card away from an automatic suspension.