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.
Bolton Wanderers vs Sunderland Line Up
Bolton Wanderers (4-4-2): Jaaskelainen; Steinsson, Cahill, Wheater, Robinson; Lee, Muamba, Cohen, Petrov; Elmander, K Davies.
Sunderland (4-5-1): Mignolet; Onouha, Turner, Mensah, Bardsley; El Mohamady, Cattermole, Colback, Henderson, Muntari; Sessegnon.
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