Latics chairman is keen to keep hold of the Spanish tactician after it is revealed that the former Swansea boss will leave the DW Stadium at the end of the current campaign
A Goal.com exclusive revealed that Martinez will step down as Wigan manager even if the club survives in the Premier League after the Spaniard and the club mutually agreed not to negotiate a new contract.
But Whelan still remains hopeful of retaining Martinez's services, despite the club being embroiled in yet another relegation dogfight.
"I will stick with Roberto Martinez for as long as I can," he said.
Martinez is widely regarded as one of the most talented young managers in the English game, having guided Wigan to safety over the last three seasons.
"I have said Roberto will go to one of the big clubs in Europe or the UK. He is a very high quality manager," added Whelan.
"He is a gentleman. He is 100% honest and I have great admiration for him."