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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: external-link "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.