But last season's Premiership player of the season is enjoying club rugby.
The former England wing will call time on his five-year stint with the Londoners this summer and make the move to France.
It left director of rugby McCall delighted at what he had seen in the 2017 final at BT Murrayfield.
He does not believe the missing players are disruptive to the rest of the team, saying: "I think if we let it be it can, but we just have make sure on days like today we get our learning done for the weekend so we feel confident going into it". The age profile of the group is good and if we're hungry enough and humble enough there's no reason why we can't get better. "Hopefully if we can do that then we'll get a good result".
Saracens, however, as they have so many times before, held their nerve under pressure in a superb atmosphere as Alex Goode broke through for the killer third try in the 73rd minute which Owen Farrell converted from the touchline.
Chris Ashton, in his final European appearance with Saracens before joining Clermont's French rivals Toulon, opened the scoring with a record-breaking 37th tournament try. They've been close a few times but not quite done it. Farrell was on target this time, stretching the lead to 12-0.
Clermont were the last side to beat Saracens in Europe when they knocked them out of the competition in the semi-finals two years ago and are renowned for their ability to blitz teams in the early stages of games. "It was a joy to be on the field with the rest of the team". Fritz Lee, Parra and Lopez were all involved, then openside Peceli Yato made vital ground on the left before offloading to winger Nick Abendanon, who was unstoppable from the edge of the 22.
Saracens' self-belief is extraordinary and the longer the game is in the balance, the more they become favourites to win this.
However, he raced on to Goode's kick to do a swan dive over the line 10 minutes later.
Saracens marched down the other end and Farrell scored a penalty to seal the victory.
Both sides had their chances before the interval but given Clermont's tradition for winning matches from a strong start, Saracens would have gone into the interval the more content side and when Farrell landed a penalty soon after the break, their march to victory appeared on course. "We weren't able to reverse the pressure". Cons: Parra 2. Pen: Parra.
But Goode weaved his way over for the third try and Farrell converted.
Replacements: S Brits for George 50, T Lamositele for M Vunipola 77, P du Plessis for Koch 77, J Hamilton for Itoje 78, S Burger for Wray 61, B Spencer for Wigglesworth 78, A Lozowski for Wyles 78, D Taylor for Barrit 53. A magical Clermont try in the 52nd minute, started from his own line by Scott Spedding and finished a bewitching blur later by Nick Abendanon raised hopes that the perennial bridesmaids might at last have their day in the sun but it was a flailing blow from a team on the ropes.
Farrell's penalty from 49 metres fell the wrong side of the crossbar, yet Saracens tightened their grip on the contest, and it seemed inevitable when George Kruis forced his way over for his side's second try, powering through Raphael Chaume and Sebastien Vahaamahina following wave after wave of powerful drives and offloads.