Andy Butler: Doncaster Rovers sign Sheffield United defender

Andy Butler (right) made 13 appearances for Doncaster during his loan spell with the club

Doncaster have signed Sheffield United defender Andy Butler for an undisclosed fee on a two-and-a-half-year deal.

The 31-year-old joined Rovers on loan in October and has since made 13 appearances for Paul Dickov's side.

Doncaster-born Butler joined Sheffield United in the summer but made only one appearance before being loaned out to former side Walsall in September.

Butler told the club website: "I'm really enjoying my time here and the manager's brilliant with me."

Meanwhile, fellow defender Luke McCullough has signed a new two-and-a-half-year deal.

The 20-year-old joined Rovers from Manchester United in July 2013 and has made 43 appearances for the club.