Duff says he can only improve now Shaun has joined
The 26-year-old couldn’t help but cast an admiring eye as his rival for a place in the team made an impressive debut in the club’s 1-0 victory over AC Milan in Boston on Sunday.
Duff was one half of the double act which provoked fear in the Premiership last season as him and Arjen Robben brought the thrill of playing with two wingers back to English football.
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