Cornish Pirates boss Ian Davies says his side are focused on trying to win the British and Irish Cup.
The Pirates, who are ninth in the Championship, won the title in its inaugural season back in 2010.
"Mathematically now we're going to struggle to be in the top four, so therefore we can't win the Championship," Davies said.
"Therefore the only option we've got now is to try and win the British and Irish Cup," he told BBC Radio Cornwall.
After getting two bonus points in a close loss at league leaders Bristol last week, Davies says he faces a tough task in picking a side to face Doncaster - who beat the Pirates last month - in their quarter-final tie on Sunday at the Mennaye.
"We said that the Doncaster game and the Bristol game would give everyone their chance to put their hands up for the British and Irish Cup, which is now our ultimate focus, and the boys have certainly done that," said Davies.
"Tom Duncan was outstanding in leading the side, he led by example, while Kyle Moyle's finish for his try was fantastic.
"To get Rheon James back and with game time under his belt was important for us as well, but the young front row were outstanding, playing against international players."
Doncaster are second in the table and have not lost in their last 12 Championship games - a run stretching back to October.
"It's a tough game against Doncaster, who are the form team in the Championship at the moment and have a really strong squad," added Davies.
"They're very determined to get to the final of the cup for the second consecutive year as well, so it's a tough ask, but ultimately to win the cup you've got to play these tough teams."