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The English actor, 36, stars as Holmes's sidekick alongside Robert Downey Jr. in Guy Ritchie's detective thriller.
"When I was asked to get involved, Robert was already set as Sherlock and Guy was directing and I knew from then that it was going to be a different take on the older films of Sherlock Holmes," Law told PA.
"They weren't asking me to put on two stone and fool around and put my foot in waste paper baskets, they were asking me to play Watson with a bit more edge.
"I hadn't read the books as a boy, so what was intriguing was to see how much of this new 'rediscovery' was already in the source material.
"It was a happy juggle between going back to Conan Doyle and relishing in all the accuracy that had perhaps been overlooked in the past, and also looking to the future and adding a new energy for an audience that we hope will discover Sherlock Holmes for the first time."
Sherlock Homes is released in cinemas on December 26.
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