Motherwell's 3-0 win over St Mirren on Saturday was their 10th victory from 10 games against sides in the bottom half.
But they have only taken one point from seven matches against their top-six rivals ahead of their clash with third-placed Aberdeen at Pittodrie on Boxing Day.
McCall said: "It's quite an amazing stat. We have won 10 games and each of them have been against teams in the bottom six. We managed one result up at Tannadice, where I thought we played really well.
"You don't want to lose, that's for sure. We do believe if we manage to finish above Aberdeen, that would certainly take us into a European spot.
"But there is a long way to go. We are not going to get carried away with back-to-back victories.
"When you do play teams at the top who you are neck and neck with, I think the key is not to lose, not that we are going up in any negative way. We will certainly be trying to get the three points."
Aberdeen have won twice at Fir Park this season, a 3-1 victory after Motherwell's return from a Europa League trip to Russia followed by a 2-0 League Cup win with 10 men.
And McCall feels Aberdeen are the team to beat outside Celtic following their improvement under Derek McInnes.
"Derek has brought in some good players allied to the strong players they had," said McCall, who will have goalkeeper Gunnar Nielsen back in his squad following a thigh injury.
"There is no doubt for me, outwith Celtic, they have the strongest squad in depth.
"But other sides like ourselves, Inverness and St Johnstone, and obviously Dundee United, will think team-wise we are all very similar and we have got to go up there and prove that."
Meanwhile, McCall reported "promising" dialogue over attempts to extend the loans of Henri Anier and Lionel Ainsworth.