Raper, 48, who was in charge of Castleford from 1997-2001, has offered to return to his old Super League club following the departure of Ian Millward. Tigers chief executive Steve Gill says the club are considering the offer and it is thought Raper could be appointed as interim boss as soon as next week.
Orr insists he would be happy to continue his apprenticeship under an experienced boss and has this week been taking tips from Leeds coach Brian McDermott, under whom he played for London Broncos. "I've said I need to learn my trade here," said Orr, who broke into the Castleford team under Raper.
"I'd be silly not to listen to people like Mac and Stuart Raper. They've all been there and done it and I haven't.
"Whoever comes into this role, I'm more than happy to work alongside and hopefully they will better the team and educate me along the way so that I can become a better coach for it."
Raper went on to take Wigan to Challenge Cup glory in 2002 after leaving Castleford, before returning to Sydney to take charge of his former club Cronulla but he has been without a club since 2006 and recently lost his job in the referees department at the NRL.
The Tigers face Leeds on Friday night and McDermott has spent this week plotting Castleford's defeat but he took time out to offer advice to his old midfield general, which was greatly appreciated by the former Great Britain scrum-half.
"I've got a lot of respect for Mac," said Orr.
"He's a good guy and a great coach. I thoroughly enjoyed working with him.
"What he's done at Leeds has been fantastic and I'd be foolish not to listen to someone like him."