Red Bull and Ferrari are considering their next moves after Mercedes' highly controversial Pirelli tyre test.
The FIA banned the German team from taking part in July's Young Driver's Test, a penalty which was not thought to be strong enough by its two main rivals.
According to The Times, Red Bull and Ferrari might now boycott the Young Driver's event at Silverstone, while Christian Horner's reining championship outfit could also run their own private three-day test.
Rules are in place within F1 to prevent teams from carrying out unauthorised testing during the season and both Ferrari and Red Bull are known to be dissatisfied with Mercedes' lenient punishment.
The Times reports that Red Bull are threatening to take the law into their own hands in order to challenge the authority of the FIA and its president Jean Todt. It is also suggested that Red Bull would be willing to take the risk of a reprimand and face the same penalty as Mercedes if it could benefit from three days worth of testing.
Ferrari has even ridiculed the events on its official website, with its anonymous and infamous blogger Horse Whisperer stating: "Today we learned, that even if one is guilty and in this case that is an indisputable and verified fact, there is always a way of muddling through as best one can."
It goes on to say that "one only has to suggest to the judge what the penalty should be and even better, why not make it something light like a rap across the knuckles".
However, principal of Mercedes Ross Brawn has claimed that his team has a "blemish-free" record and he was looking forward to the rest of the season.
He told Sky Sports News that there should be more clarity on testing rules, as the team claimed that it believed it had permission to take part alongside Pirelli for tyre safety reasons.
"Obviously things have gone wrong and we have received penalties, we understand that and we accept it."