Casper suffered a double fracture to his leg while playing for the Royals against Cardiff on 26 December, 1999.
He claimed damages for past and future loss of earnings and pain and suffering from Cardiff and their former player Richard Carpenter, now at Brighton.
"It's a matter of great relief that this has been settled," Casper said.
Casper, now 28, began his career at Manchester United, and spent time on loan at Bournemouth and Swindon before joining Reading in September 1998.
Full story from the BBC.