The Red Devils boss has splashed the cash in his first three transfer windows at Manchester United, spending £285m on six key singings.
Meanwhile, the club's wage bill has gone up by 13.5 per cent to £263.5m, according to the most recent released financial results.
And BBC Sport claim the United board want Mourinho to control costs before he looks to bring in any new players at Old Trafford.
Mourinho has sold 16 players since replacing Louis van Gaal at the club.
But only the sales of Memphis Depay (£16m) and Morgan Schneiderlin (£22m) have generated significant income.
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