Might be this you're thinking of?
https://www.bbc.co.uk/sport/football/44013364
"For 10 months I get asked 'why always Lukaku? Why always Lukaku? Why always this player?'" Mourinho said.
"'That guy doesn't have a chance to start, the other one is on the bench'. You know why now."
The players in question he's criticising are Martial (astonishing there) and Marcus fecking Rashford, who he also tried to humiliate by turning to the Old Trafford crowd and shaking his head theatrically when he missed a shot in another game.