Northampton have signed Cambridge's Fred Murray for an undisclosed fee.
Murray started as a trainee at Blackburn before joining Cambridge
The 22-year-old defender has joined for just under three years and Cobblers manager Colin Calderwood said: "He will be a good addition to the squad.
"He is a fit boy with a very good left foot and he will bring some balance to the centre of our defence.
"He will increase competition in the team and will benefit us, not just this season but the years ahead," Calderwood told his club's official website.