Darren Patterson hailed Chris Carruthers after the left back became Oxford United's second signing of the summer.
The 24-year-old joined the U's just in time to be unveiled at their Open Day on Saturday, which saw around 2,000 fans turn out.
Carruthers made more than 70 starts for Northampton after progressing through the youth system, and was selected for the England under 20s side.
He then moved to Bristol Rovers in 2005 after a successful loan and made well over 100 starts for Rovers.
"Chris is another great pro who has bags of experience considering his age," Patterson said.
"Like Joe Burnell he has chosen us over a number of league clubs and we are really excited to have him join."
Despite only joining the club last week, Burnell has already got his hands on some silverware for the U's.
He was elected captain for the inaugural Oxford Mail fans v Oxford United penalty shoot-out, and helped his side to a 3-2 victory.
Although the pressure got too much for Adam Murray, who placed the very first attempt wide of the target, United bounced back to win the trophy.
Jay Harriott and Tony Snellgrove scored for the fans, with Luke Foster the other U's player not to find the net.
Pete Burton, Sean Cleaver and Thom Airs made up the fans' team.
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