Saracens will look to become the fourth club to win back-to-back European Cup titles, after Leicester Tigers, Leinster Rugby and RC Toulon.
But the English champions clung on to the continental title they lifted for the first time past year when Alex Goode dived over in the corner seven minutes from time.
"We spoke all week, with these big games you have to treat them like you treat every other week".
McCall said: "It is great to win back-to-back (finals) but the manner in which we did it today was the hugely encouraging thing". We lost to a much better team.
"We have an understanding of how they play but it was good to speak to him about certain aspects and have a deeper understanding".
His touchdown was his 37 Champions Cup score and set a new record try tally for Europe's premier club competition.
Farrell's conversion attempt hit the post and he then came up short with an ambitious penalty, but still the English side continued to probe and Kruis powered over for a second try. Farrell was on target this time, stretching the lead to 12-0.
The London club started strongly with two tries in the first 22 minutes and looked as they were going to cruise to victory but Clermont fought back to ensure there was only a point in it going into the last 10 minutes.
Clermont Auvergne's Remi Lamerat scores a try against Saracens during the European Champions Cup Final at BT Murrayfield, Edinburgh, Scotland, Saturday May 13, 2017.
DIRECTOR of rugby Mark McCall admitted that Saracens got what they deserved on Saturday as they slumped to a 35-15 defeat at Wasps which saw them miss out on a home semi-final in the Aviva Premiership play-offs.
The French side have built their success this term on starting with a rapid tempo but they found themselves having to cling on as Saracens darted out the blocks.More news: Ex-congresswoman found guilty of using funds from fake charity
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Saracens had lost the assurance of the opening quarter and had to reorganise their defence when their captain, Barritt, left the field injured with 26 minutes to go.
But at length, with eight minutes left, the pressure told, as an overlap on the right gave Goode the space to race through.
Farrell converted for 25-17, with his dad Andy, the Lions assistant coach, looking on, and when Lopez missed a penalty from middling range soon afterwards, having earlier put a drop-goal shot wide, fearless Clermont knew the game was up.
Goode's try, converted from near the touchline by European player of the year Farrell, put Saracens out of sight.
Their head coach Franck Azema said: "We're disappointed of course. We weren't able to reverse the pressure".
A try scorer and try maker in the semi-final win over Leinster Rugby, Strettle is still included in the Saracens team "WhatsApp" group.
Saracens: Tries: Ashton, Kruis, Goode.
A Vunipola surge took the No8 to within two metres of the line and, with Schalk Brits now on the pitch instead of George, Saracens enjoyed more continuity.
Following a close-range scrum, Aurelien Rougerie took the ball up and after he was denied, fellow centre Lamerat went low to score, with Morgan Parra converting.
Fly-half Farrell was named European Player of the Year after the final whistle, following in the footsteps of teammate Maro Itoje who won in 2016, and admits the closeness of the squad played its part once again.