The highly-rated Spaniard’s potential has again been underlined by Latics’ run to the semi-finals of this season’s FA Cup. There has been speculation over Martinez’s future for each of the past two summers following his success in steering Wigan clear of relegation from the Barclays Premier League. And Whelan told BBC Radio Five Live’s Sportsweek programme: “I will lose him, I don’t think there is any question about that.” Press Association Whelan has said previously that former Wigan player Martinez, 39, will eventually leave the club with his blessing but he wants him to stay as long as possible. “We have known each other and been together a long time. Hopefully that will continue,” he said “He is a top-class manager and he will get one of the top clubs in Europe. The big clubs in Europe, when they want a manager, Roberto is obviously the man. He is stone-cold brilliant as a manager.” There was a downside to Wigan’s superb 3-0 quarter-final win over Everton in that Premier League action elsewhere meant they slipped back into the bottom three. But Martinez has been involved in a relegation battle every season since he took charge at the DW Stadium in 2009 and his last two escapes have been particularly remarkable. Whelan is confident he will achieve safety again, saying: He said: “We have been there before and fought our way out of it. We are going to do exactly the same again, I hope. “We have played well all season and just had so many injuries and bad luck. “We played Everton off the park and have done that so many times this season but at times we have had up to eight players injured. It is very difficult to take that kind of punishment.” Wigan chairman Dave Whelan has reiterated his belief manager Roberto Martinez is destined for one of Europe’s top clubs.