Asked who the toughest opponent he ever played against is, Alexander-Arnold said: "I would say Brandon Barker, played for [Manchester] City.
Barker, 28, most recently played for Morecambe in League Two but was released last summer after making just two appearances.
Barker played for the likes of Rangers, Hibernian and Preston after coming through the ranks at Manchester City.
TRENT ALEXANDER-ARNOLD'S toughest-ever opponent Brandon Barker has joined an eighth-tier side.
The winger has signed for Avro FC, who are 14th in the Northern Premier League Western Division.