The Englishman netted twice at Tannadice Park to put him on a career best of 24 goals for the season.
"When big Michael has not played well this season he has scored, and when he has not scored he has played well," McCall told Sky Sports News. "Tonight he did both - he led the line superbly and also scored two goals.
"He's a terrific guy to have in the dressing room and I'm delighted he has broken his record. I'm delighted for him and the whole team."
Motherwell's victory over Dundee means that Celtic will be crowned champions if they avoid defeat at home to Inverness Caledonian Thistle on Sunday.