Farrell will miss the first five games of the season after suffering a thumb injury in a pre-seaon match against Western Force.
Saracens will play Northampton Saints on Saturday September 27. The Saints also play Western Force this Saturday.
Sp
eaking to the BBC, Farrell said: "It's totally frustrating - but you won't find me sitting in the corner and sulking."
"It's especially frustrating after flogging yourself for eight weeks in pre-season and then just when you start to look forward to the games, this happens," added Farrell.
He revealed: "Things were going really well. I played out in Bayonne in a friendly the week before, felt in great shape and was looking forward to getting on the field against Western Force.
"I had only been on a few minutes when I went in for a cover tackle and took the impact on my thumb. As soon as it happened, I knew I was in a bit of trouble.
"I can still train and I shall use this time to get fitter and stronger and turn this time into an advantage.
"I will be arranging my training around the first team to make sure I am at all the sessions," he said.
"I'll be doing whatever I can to continue to help push the team in the right direction, maintaining the progress we have shown in pre-season."
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