The Spanish playmaker, 30, was left on the bench for Sunday's 2-1 win over Arsenal – in Arsene Wenger's final Old Trafford appearance.
On Monday morning though, Mata took his ten-month-old pup for a stroll around Altrincham to perk up his mood.
Mata took his other half and pooch around his usual haunts – spotted heading past the Common Ground coffee shop.
Last month, the former Chelsea star strolled out of self-professed "speciality coffee shop" – who serve everything from espresso to Aperol Spritz and craft beer.
But, two days after his 30th birthday, he took his young dog along for the journey.
On Sunday, Mata was seen being given birthday bumps by his team-mates in training ahead of the Arsenal game.
Meanwhile, Mata is widely expected to stay at the club beyond this summer, following glowing praise from Jose Mourinho earlier this year.
JUANDERFUL Mata given birthday bumps in training as De Gea reveals Sir Alex Ferguson advice from when he first joined
The United boss claimed: "Mata is very important. He is another one, big story when I arrived one and a half years ago – 'Mata in trouble, in trouble, in trouble'.
"Now he's getting an extension of one more year. [He is] an important player for me, an important player for the club, an important player for the other players."
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