He scored his first goal for Doncaster in an EFL Trophy tie against Mansfield Town on 30 August 2016 .
On 12 July 2016 , prior to the start of the 2016 -- 17 season , Calder rejoined Doncaster on loan until January .
Calder scored Calder 's first goal Doncaster Doncaster in an EFL Trophy tie against Mansfield Town on 30 August 2016 .
On 12 July 2016 , prior to the start of the 2016 -- 17 season , Calder rejoined Doncaster on loan until January .