Harald Brattbakk has urged Marcus Pedersen to snub Premiership offers for Celtic.
Stromsgodset striker Pedersen is also wanted by Sunderland, Blackburn, Bolton, Everton and Fulham.
Former Hoops striker Brattbakk told the Scottish Sun: "Any player who has the chance to join Celtic should grab it with both hands. It's a huge opportunity and something you really can't say no to.
"I know how big it is. I know how honoured I was to play for the club. If he gets the offer to go to Celtic it shouldn't be a hard decision.
"Personally I would always tell him to sign for Celtic.
"When I was there I had the best time of my career. To be part of that period was amazing for us and it's something I'll never forget."