Leading figures at Dortmund believe United are winning the race to acquire one of Europe's hottest properties, although an initial £120million asking price may prove troublesome.
Asked about the ongoing transfer talk, Mata said: “Should we sign Jadon Sancho?
“What do you want me to say? We all know he's a great player. He's having a fantastic season at Dortmund.
“But it's not my responsibility to speak about those things. I like him as a player but I cannot reply to that."