Head coach Garry Monk has backed new signing Korey Smith to have a big impact on the Cambridge United squad this season. The midfielder, who was part of the Sky Bet League One promotion-winning group at Derby County last term, featured for the first time in U’s colours on Friday evening during the 1-0 pre-season friendly victory over a West Bromwich Albion XI. And while he only featured for the opening 45 minutes before being replaced at the break, the 33-year-old made an instant impression at the Cledara Abbey Stadium. There was a real composure about the way that Smith went about his busines…