The minor premiers face the Gulls in the semi-final at Iluka this Saturday and Sunday after an unexpected defeat at the talons of the Hawks last weekend.
Olsen dismissed claims the Centurions, who knew they would advance regardless of winning or losing, were not concerned about the result.
He conceded Gosnells simply played better cricket in bowling Joondalup out for 164 before amassing 218 runs of its own in wet conditions at Iluka.
‘They won a very important toss,’ he said.
‘We had to go in and bat, they nicked a lot of our boys up, then we changed plan to go out and try and be aggressive and we made it to 160.
‘But we bowled poorly and Darcy Short (109) batted beautifully.’
Olsen asserted there was ‘no tomorrow’ against Scarborough, expecting it to be a game won with the bat.
He predicted a tough encounter, with the Gulls in good form.
‘If we can put together a competitive total, we will back our bowlers,’ he said.
He called on his young players to make a statement in the finals if they were to impress state side selectors.
The side’s teenage trio of Josh Inglis, Clint Hinchliffe and Jaron Morgan has had an impressive year in WA cricket’s top grade, but Olsen said they needed to have an impact in big matches to take the next step.
‘I’m a firm believer that only a certain individual can play finals cricket when everything’s on the line,’ he said.
‘They’ve got to take it to the next level.
‘They’re young and exciting cricketers, but for them to go to the next step’