"It was a really close game. I know that a 12 point gap seems it was comfortable enough for Toulon. But it wasn't," said the Saracens director of rugby.
"We did a lot of things well, but it just wasn't quite enough. We had a few chances, but we failed to convert them.
"There were lots of penalties against the attacking team and that's why you didn't see any tries. They hoofed the ball into our half and waited for us to make mistakes.
"When it was a three and six point game there was nothing in it and we put them under a lot of pressure. We were well beaten by Clermont in last season's quarter-final, but I didn't feel that this time.
"There is growth and progress in this team. History says that you have to earn your spurs in this competition, just as Clermont have done.
"We have reached a quarter-final and now a semi-final and, hopefully, we can come back next year even stronger."
Saracens still lead the Aviva Premiership with one round to go and will have a home semi-final to look forward to whatever happens in that game. But McCall is banking on his side having three games left, and a return to Twickenham for the Premiership final.
"We still have games left to play, starting with an important one against Bath. The season is far from over for us," he added.