Palmer, 22, enjoyed a stand-out campaign for Chelsea last season, scoring 22 Premier League goals and providing 11 assists.Manager Gareth Southgate has used Palmer sparingly so far, but he again impressed when he was sent on for the second half of the last-16 match against Slovakia, when England came from behind to win after extra time.London-born Duah is a Chelsea fan and admits he has been left perplexed as to why Palmer has not seen more game time ahead of the quarter-final with Switzerland in Dusseldorf on Saturday.”He (Palmer) did a very, very good season last year,” Duah told a press…