St Mirren boss Stephen Robinson says his team will need to rely on "desire and attitude" when Premiership leaders Hearts come to Paisley on Tuesday.
Robinson's side are without a win in seven matches, including a 2-0 defeat by 10-man Hearts last month.
Both teams were in action on Saturday as Hearts beat Dundee United and St Mirren drew with Dundee, but Robinson says he is not able to rotate his squad like opposite number Derek McInnes.
"I expect another tough challenge," Robinson said. "We only played Hearts recently, there was not a lot between the teams at that stage but we had individual errors.
"But we had a clean sheet on Saturday, so that's a positive. We have to do the same. We have to keep a clean sheet.
"We know they've got a big squad and we know they can change it up and change things around. We can't. But we'll go with the same desire and attitude, I've no doubt about that.
"We just need to add that bit of quality, which I'm hoping will come when the players we've brought in get that extra sharpness from games and a little bit of confidence as well.
"That's obviously something as well that comes with winning games. We look forward to the game."
The Buddies are set to be without injured trio Mark O'Hara, Jonah Ayunga and Keanu Baccus plus the suspended Jake Young, unless an appeal against the attacker's red card in Saturday's goalless draw with Dundee is successful.
