Nottingham director of rugby Glenn Delaney says his side are more than capable of pulling off a shock win at play-off favourites Bristol on Friday.
The Green & Whites are third in the table and seven points off a qualification place after last week's home loss against the same opposition.
Nottingham need to win to be certain of staying in the end-of-season play-offs.
Delaney said: "If play-offs teach you anything, it's every week something different is waiting to happen."
The Nottingham chief feels his side's spirited second-half revival against Bristol last week will give them belief at the Memorial Stadium.
And he also feels Doncaster, who are bottom of Pool A, have shown nothing is certain with their impressive display in losing to London Welsh last week.
"Doncaster weren't given a hope against a side that achieved what so many thought was impossible when they nearly beat the in-form Bristol on their home patch," Delaney said.
"And when you break down our performances, there should be no surprise in what we are capable of."