Sorry cannot help you.
I do not know how much Juan Mata got his pay cut though maQny reports stated he will be getting £45K per week.
But I got news of his contract renewal from the Official announcement.
I too lazy to copy the whole article.
Here is part of it and the link to it.
https://www.manutd.com/en/news/detai...-at-man-united
The Manchester United is delighted to announce that Juan Mata has signed a new contract, which will keep him at the club until June 2021, with the option to extend for a further year.
During his time at United, Mata has won an Emirates FA Cup, a League Cup, the UEFA Europa League and FA Community Shield.
The midfielder has been capped by Spain on 41 occasions and was a member of the squad that won the 2010 World Cup, as well as the 2012 European Championship......