Doncaster completed the loan signing of Fulham midfielder Michael Timlin before Thursday's transfer deadline.
The 21-year-old, who can play on the left of midfield or in the centre, has joined for the rest of the season.
Timlin is yet to appear in the Premiership for Fulham, but has made three appearances in cup competitions.
He also had a brief loan spell at Scunthorpe earlier this year, joining them in February but only having one substitute outing for the Iron.