The Steelmen were drawn against Russian side Kuban Krasnodar in Friday's third qualifyinground draw.
Hoping to join them at that stage in qualifying are fellow Scots Saints, who claimed an impressive 1-0 first leg lead over Rosenborg in Norway.
Motherwell face a tough challenge themselves against a side who finished fifth last season and who have been boosted by the arrival of former Liverpool and QPR striker Djibril Cisse this summer.
McCall said: "It was fantastic, St Johnstone with a positive attitude and getting a great result. That's what we're going to have to have.
"First and foremost we have to go over to Russia and make sure we are still in the tie but hopefully with a lead.
"We've got to aim to progress into the next round. We will just be positive and do the best we possibly can.
"If we can do our best and it gets us through then all well and good."