Mata left the Blues for United last January but is yet to make a playing return.
And while the Spain international says he is looking forward to catching up with old friends at Chelsea, he claims United will be fully focussed on taking three points after derby victory over City at the weekend.
We get to this game in a very good moment, with confidence, but we are aware that we must perform at our best level if we want to beat Chelsea.
Juan Mata
He wrote in his blog: "From this Monday we are already thinking about our next 'final', a visit to the leader of the Premiership.
"Needless to say that it's going to be a very special game for me. I already played against Chelsea in the first half of the championship, but going back to Stamford Bridge for the first time will bring me plenty of good memories, for sure.
"The day I arrived to this great club I wrote: "Gratitude is the memory of the heart". And I keep thinking the same.
"At that time I had the chance to thank everybody who helped me in London during those two and a half years, and next Saturday it will be nice to meet former team-mates, fans and friends. I keep good memories of them and I wish them the best.
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"Obviously, our intention is to get the three points again and we will try from the kick-off until the final whistle.
"The best thing is that we get to this game in a very good moment, with confidence, but we are aware that we must perform at our best level if we want to beat Chelsea."
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