Striker Forte has returned to the club on loan from Southampton and former Scotland international Robson has signed until the end of the season following his release from Major League Soccer side Vancouver Whitecaps.
Both players stepped off the substitutes' bench in Friday night's home defeat to Coventry as the Blades slipped to a third straight league defeat at Bramall Lane.
Manager Danny Wilson has no new injury or suspension problems, but Marcus Williams remains sidelined through illness and fellow defender Matt Hill will not return to contention until the weekend after being sidelined with a broken jaw.
Centre-half Neill Collins returned against Coventry wearing a protective mask following a triple fracture of his cheekbone and is set to continue as the Blades chase their first league win of the year.
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