Todd Boehly has questioned why Chelsea did not make an approach for Aurelien Tchouameni.
The French midfielder moved to Real Madrid from Monaco this summer in a deal which could reach £88million.
Premier League side Chelsea were interested in Tchouameni last summer, but instead plumped for Saul Niguez on loan - a decision which has reportedly left new Blues owner Boehly baffled.
The Premier League side considered a move for the French midfielder last summer, but opted against the move, reportedly unsure of his ability to contribute to the first team immediately
According to Sport, the US tycoon - who replaced previous owner Roman Abramovich in May - is confused about why previous transfer chief Marina Granovskaia, who has since left, opted against the move.