straight to your inbox every day for freeDean Smith admits Aston Villa cannot rest on their laurels if they want to keep Jack Grealish at the club long-term.After impressing in the Premier League last season, the attacking midfielder attracted interest from Manchester United but he ultimately stayed put at Villa Park after rescuing his boyhood club from relegation.This season has seen him continue his good form, with Villa banishing relegation fears after a series of smart summer acquisitions in