olton boss Owen Coyle has told Wigan they will have to dig deep if they want to sign goalkeeper Ali Al-Habsi on a permanent basis.[LNB] The Oman international is on a season-long loan at the DW Stadium and has impressed in five starts this season since displacing Chris Kirkland between the posts.[LNB]Latics boss Roberto Martinez has said he would like to hold onto the player for "as long as we can", but Coyle has warned a substantial offer would be needed to prise him away.[LNB]"The only way they can keep him for good is by paying our club a large transfer fee - if indeed that's acceptable to us," Coyle told the Wigan Evening Post.[LNB]"Wigan can make as much noise as they want, but ultimately I'll decide whether Ali Al-Habsi is a Bolton Wanderers goalkeeper or not."[LNB]He added: "We put him on loan because it was a win-win-win situation. Ali gets games in the Premier League, we get a terrific loan fee, and I have got a terrific goalkeeper in Adam Bogdan, who has shown he can step in when necessary - so it was a great bit of business for us."