Motherwell arrived back at Fir Park after 6am on Friday morning following their Europa League exit against Kuban Krasnodar.
McCall told MFC TV: "I've spoken to the players and they've all said they had a good sleep yesterday.
"Just like the staff, the worst they've suffered is mosquito bites. They must have had a feast the night we trained in Russia - I am covered in them and have had to use Calamine lotion to take the itch out.
"Other than that, everyone is feeling good. We've trained well this morning and we now prepare for a big match against Aberdeen on Sunday."
Like Motherwell, Aberdeen won their opening Scottish Premiership match, and the Dons will travel to Fir Park determined to end a near five-year wait for a league victory over the Lanarkshire side.
"I saw them play last week against Kilmarnock and they performed well," he added.
"McGinn and Hayes are always capable and Robson and Flood bring them experience, and overall they are a good side but so are we and it's a game we're really looking forward to.
"I'm sure they'll bring a huge crowd with them so we need our support to be up for it as well."
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