Charlton have completed the signing of Sean Clare from Oxford for an undisclosed fee.
The 24-year-old midfielder, who was in Charlton's academy as a youngster and impressed on loan at Burton last season, has agreed a two-year contract at The Valley.
Clare told the club website: "It's really exciting. I'm really happy to get it done. It is a club that I've had close to my heart for a very long time.
"To come back and have the chance to do what I dreamt of as a kid, to play in the first team, to be successful with a massive club like Charlton is something I'm really excited to do."