The new one-year extension to his current deal will keep the 41-year-old at Doncaster until the summer of 2013.
Sullivan joined Doncaster from Leeds in 2007 and is currently the No.1 at the club.
The new one-year extension to his current deal will keep the 41-year-old at Doncaster until the summer of 2013.
Sullivan joined Doncaster from Leeds in 2007 and is currently the No.1 at the club.
