Daley Blind, Marcos Rojo and Radamel Falcao all made their debuts for the club during the 4-0 win over Queens Park Rangers on Sunday, while record signing Angel di Maria scored his first goal for United since his British-record arrival from Real Madrid last month.
Speaking about those players, Mata, who also found the net against the Hoops, wrote in his blog: "Personally, playing alongside guys like Blind, Rojo or Falcao is a joy. They will become more and more adjusted to the team and their quality will help us a lot.
"We have been working together for a few days now, getting to know each other, and I'm sure we will be a better team as weeks go by.
"As regards to Di Maria, it seems he's been with us for a long time. Angel is a very enthusiastic guy, a great signing. After the game I gave him the man-of-the-match award and improvised as his translator for the TV interview. He looks happy and that makes us happy as well."
Next up for the Red Devils is a trip to Leicester City this coming Sunday.