Interim Aberdeen boss Peter Leven was left regretting a series of missed chances at Fir Park as his side lost 2-0 to Motherwell on Sunday.
"I'm disappointed, the chances we created, we have to take them," he said.
"The first goal was a handball for me, I don't know why the referee's not given it straight away.
"It's frustrating, but I did see signs that were positive. There's not many teams come to Motherwell and have more possession.
"We'll keep battling until it's mathematically impossible, we'll keep going and see where it takes us.
"It has to be a win on Wednesday evening, we're the holders. We need a big performance at home to try and progress."