Cullen was handed his international debut in the week, and the West Ham academy graduate scooped up the man of the match award for his nation.
Cullen helped Ireland pick up a 3-1 victory over Bulgaria, and McCarthy was very impressed with the 23-year-old’s contribution.
“Neither was Billy Bremner and Johnny Giles,” McCarthy said.
“I haven’t got reservations because he’s technically very good and a tough little sod. He puts his foot in and stands his ground. You wouldn’t think he’s a little fella that gets knocked around. He handles the ball particularly well. He’s got good legs and gets around the pitch.”
West Ham must be keeping a close eye on Cullen, as he keeps impressing on loan spells and now at international level.
Cullen has been with Charlton Athletic on loan for the past two seasons, and he already looks at home in the Championship.
The 23-year-old must be coming into Manuel Pellegrini’s thinking for a place in West Ham’s squad next season now, but the Chilean boss has so far been reluctant to use him.
Pellegrini is yet to pick Cullen at all since taking charge at the London Stadium in 2018, with the midfielder being sent out on loan instead.
If Cullen does return to West Ham after his current loan with Charlton he would be in competition with the likes of Mark Noble, Jack Wilshere and Declan Rice for a first-team spot.
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