Head coach Neil Harris is reportedly set to leave Cambridge United and make a shock return to return Millwall. Harris has taken charge of 14 games in all competitions since arriving at the Cledara Abbey Stadium in early November following the departure of Mark Bonner. But after five wins, three draws and six defeats, it appears that Harris is ready to call time on his short tenure. Widespread speculation is claiming that the 46-year-old has agreed to rejoin Championship outfit Millwall, who are expected to part company with their boss Joe Edwards later today. While there is no official word fr…