Chelsea have set an astonishing asking price for Nicolas Jackson who has emerged as a transfer target for Manchester United. The Blues spent ÂŁ32million on the Senegal international who joined the west London club from Villarreal two years ago. Jackson has shown flashes of potential during two turbulent years at Stamford Bridge but has been let down by inconsistent finishing and a suspect temperament. Sent off in a potentially decisive defeat against Newcastle at the end of last season, Jackson was again in hot water when he was dismissed in Chelsea Club World Cup defeat against Flamengo. Jackson was used sparing thereafter and made only one subsequent appearance as a second half substitute against Fluminense. Get personalised updates on Manchester United every day Wake up to…