Orr featured regularly at right-back at the start of the season before falling behind Wales Under-21 international Adam Henley in the pecking order shortly after Henning Berg was appointed as Steve Kean's successor in the Ewood Park hotseat.
On-loan Chelsea youngster Todd Kane is expected to make his third consecutive Rovers start on the right-hand side of defence against Brighton on Tuesday night as Henley continues his recovery from a hamstring injury, but new boss Appleton insists Orr features in his first-team plans
"He'll be vital for us between now and the end of the season," he said.
"He's got vast experience of the Championship, he's very vocal, he's a good character and he's someone that I would rather have in my side than up against me."
The 30-year-old former QPR defender has made 12 starts for Ipswich and is set to play his final game for the club at Bristol City on Saturday.