West Perth must reach the grand final to justify Bill Monaghan's three-year contract extension, according to dual premiership coach Ken Judge.
The Falcons have not won a final for a decade but must beat Claremont in the second semifinal on Sunday or win the preliminary final the following week to qualify for the grand final.
Judge, the former East Fremantle premiership coach and West Coast and Hawthorn boss, said there were still doubts over Monaghan's ability to succeed in finals.
Speaking on ABC TV, Judge questioned why West Perth had offered Monaghan such a long extension on the eve of the finals.
"West Perth would need to play in a grand final this year to justify a three-year deal," Judge said.
"If they were to go out in straight sets again, you have got to say that maybe he is a coach who can get them so far but not the whole way.
"Claremont are a hard side to beat. They are not unbeatable but they are the best side in the competition."
Monaghan was reappointed last week until the end of 2016 and will become the club's longest-serving coach when he enters his seventh season in 2015. Stan 'Pops' Heal coached for six seasons from the late 1940s, winning two flags amid 95 victories in 133 games.
Monaghan has steered West Perth to 57 wins in 103 matches over the past five seasons.
His winning percentage of 55 compares favourably with WA coaching legends Mal Brown (57 per cent), Haydn Bunton (55) and John Todd (51).
The Falcons finished fourth, fifth, third and fifth in his previous four years and will not finish lower than third this season.
West Perth lost both finals in 2011 and the first semifinal in Monaghan's first year in 2009.
The Falcons finished the home- and-away season with two losses either side of their round 23 bye, but Monaghan was reasonably satisfied with their effort against third-placed Swan Districts in a match that his team did not need to win to retain second place.
Swans triumphed by 18 points to guarantee a first semifinal berth.
"We had a significant differential on inside 50s (West Perth's 48 to 41), possessions (376 to 356) and clearances (42 to 34) so there were enough things there to think we are going OK," Monaghan said."We did enough to be happy but our focus for much of the past two weeks has been about playing Claremont in the second semi. It all starts next week."