The financial gap between the Premier League and the rest of Europe's top divisions is "too big", says AC Milan head coach Stefano Pioli.
Premier League clubs spent £815m during the January transfer window - nearly four times the combined £225m spent in Spain, Italy, Germany and France.
Pioli's Milan host Tottenham in the Champions League last 16 on Tuesday.
"I prefer to concentrate on on-field matters, but there's no match for them economically," the Milan coach said.
The Premier League's financial dominance in Europe increased to the highest proportion ever reported in January.
Spending by English top-flight clubs accounted for 79% of the total across Europe's 'big five' football leagues, where January expenditure fell by 35% from 2022.