Sergio Perez underwent knee surgery during the winter period, he has revealed.
"I had a knee operation, from which I have fully recovered," said the 23-year-old, who will be paired this year with the highly rated Nico Hulkenberg.
"Since then, I have been doing some really good work with my trainers, back home. They came over to Mexico and we did both rehabilitation and a lot of physical work to get fully fit for the first day of testing," added Perez.
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