Exeter Chiefs skipper Dean Mumm admits his side were not at the races during their 22-6 loss to Harlequins at Twickenham on Saturday.
The Australian second-row is now keen to set the record straight with victory over London Wasps at Adams Park on Sunday.
"Sunday's game certainly takes on greater importance now," Mumm told Exeter's official website.
"This week was a close battle between fourth and fifth, and next week it will be sixth against seventh.
"The games come thick and fast and every game becomes more important as you move towards the end of the season, so we need to turn ourselves around pretty sharp.
"Wasps away from home is a tough challenge, but it is one we will certainly be up for."
And Mumm reveals he was very disappointed with his side's performance in the festive loss at England's national stadium.
"It was a disappointing first half," he added.
"We did not turn up with the vigour and intent that we wanted to come with, and we consequently left ourselves with a gap which was very hard to come back from.
"The intent and the will in the second half was certainly much better, and we created some opportunities but we didn't finish them.
"It was maybe a game of two halves, but we didn't really nail the points in the second half and so it is a little bit of a disappointing trip up to Twickenham, but we move on.
"Harlequins did nothing that we hadn't seen beforehand, but full credit to them, they did attack well and with versatility.
"They attacked with kicking as well as with ball in hand, their off-loads were very good, and they made a lot of metres up through the middle with pick and go.
"They attacked right across the park. They did well and capitalised on the opportunities they had, and consequently they had a good lead at half-time."