Manchester United have spent a fortune on coaches since October 28, journalist Ben Jacobs reported.
Based on the club's financial reports, he came to the conclusion that the dismissal of Erik ten Haag and his assistants cost the "devils" 10,4 million pounds.
The Dutch coach left the team on October 28.
Manchester United had to pay the Portuguese club 11 million pounds in compensation for bringing Sporting tenor Ruben Amorim and his assistants.
United is currently in 12th place in the English Premier League with 16 points from 12 matches.
Amorim started with a draw away to Ispvič in the last round - 1:1.
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