Shaun Wane has promised fans a "very different" performance next week when Wigan host Castleford for a place in the Grand Final.
They ended their Super-8s campaign with a tense 14-12 win against Hull FC which Wane described as "ugly."
READ MORE: The Wigan v Hull FC match report https://www.wigantoday.net/sport/rugby-league/wigan-warriors/wigan-14-hull-fc-12-1-9372649
The Warriors boss rested big-guns Thomas Leuluai, Sean O'Loughlin and Sam Tomkins and was confident Joe Greenwood - who left the action for a head injury assessment - would be fit for the semi-final.
"We will be a very different team next week, so I'm buzzing," said Wane. "This felt flat, we were disjointed, they were disjointed, there wasn't much riding on it. We wanted to go through the Super-8s unbeaten and we got that - but it was ugly, no question."
Wigan trailed 12-6 at half-time and needed tries by centres Dan Sarginson and Oliver Gildart to put them in front.
One positive was the return of Liam Farrell after 11 games absent with a shoulder injury.
"Faz did a good job, John Bateman was outstanding, Dom Manfredi was good - there were some good individual performances," he said, also praising winger Craig Mullen's performance out-of-position as the bench hooker.
This was Hull FC's 11th straight defeat and coach Lee Radford said: "It's been an unbelievably challenging time when you know you're playing for nothing - you're a double glazing salesman selling poor windows to people who don't need them."
He went on to praise departing Wane, saying he was the first coach to contact him and offer him any help when he took the FC top-job. "I genuinely hope Wigan go on and win it," added Radford.
Wane, meanwhile, praised the Under-19s after their 14-6 Grand Final win against Leeds in the curtain-raiser. It was their ninth top-level academy championship in the last 11 years.
He said: "I'm so happy for Matty Peet, Shane Eccles and coach Darrell Goulding. They've done great."