Sarries continued their 100% start to the season on Saturday when they claimed a 19-12 victory at Allianz Park.
"Sometimes you've just got to win and dig in," McCall told Premiership Rugby's official website. "In the past we've been comfortable in a lot of the games and today we had to do it differently.
"I'm delighted we rolled up our sleeves and won comfortably in the end - we move onto Europe now."
Saturday's win saw Saracens open up a six-point lead at the top of the Aviva Premiership table.