Ealing are top of the Championship with six bonus-point wins from their six matches and are Saracens’ – who lost their first game against Cornish Pirates – main rivals for promotion.
"This feels like a big game, and it's that time of year where a lot of our players are used to playing important matches so there is real excitement around the group," said McCall, whose entire coaching staff signed new long-term deals this week.
“Ealing are going well, they are very impressive and are strong all round. We took a step forward against Doncaster and know that we need to do that again on Sunday.
“Our history shows that big games tend to bring the best out of us and everybody is fully charged up for this.”