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"Danny is a player we have been tracking for some time, but he only became available last week," said Curbishley to the club's official website.
"We moved in straight away and, although he was publicly linked with other clubs, we were always confident we would sign Danny.
"The fact he has chosen to come here over a number of other Premiership clubs is an endorsement of what we are trying to achieve at Charlton.
"I also believe the fact that Charlton have signed an England international from one of this country's biggest clubs shows our tactics in the transfer market are paying off.
"We have remained patient and stayed focused on bringing in the type and quality of player we have always felt we needed."