The Finn, who has played more than 500 games in 14 years with the Trotters, was surprisingly rested for last weekend's 1-0 defeat by Blackburn.
Hungarian youngster Adam Bogdan was given the nod at Ewood Park but the greater threat to 36-year-old Jaaskelainen's place in the medium term would appear to come from Ali Al Habsi.
The Oman international is coming to the end of a season on loan with Wigan in which he has greatly enhanced his reputation after four years as Jaaskelainen's understudy. Coyle insists the situation does not present him with a problem and vowed it would be a "fair fight" between the trio.
The Scot said: "Ali was allowed to go on loan to Wigan because I felt he'd been understudy for too long and he had to play. I knew the qualities he has as a goalkeeper, I also knew young Adam Bogdan is an outstanding keeper who's getting better. So for us it was always a win, win, win situation.
"When the season finishes at Wigan, and Al Habsi's been one of their best players this year, he'll return to Bolton Wanderers, and that's very clear. There's no problem regarding all the positions in our team. It's a fair fight. As a manager, I think the best one will play in that position."
Source: PA
Source: PA