Liam O'Neil: Chesterfield defender joins Cambridge United on permanent deal
League Two side Cambridge have signed Chesterfield defender Liam O'Neil for an undisclosed fee on a three-and-a-half-year contract.
O'Neil, who can also play in midfield, made 49 appearances for the Spireites after signing from West Brom in August 2015.
The 23-year-old has played in 17 League One games this season, scoring twice.
"He is a Cambridge boy returning home and is a fantastic fit for us," said U's manager Shaun Derry.