Doncaster Rovers boss Sean O'Driscoll is hoping defender Stephen Roberts will be fit for his promotion-chasing side's final two games of the season.

The 28-year-old picked up a knee injury in the 1-1 draw at Leyton Orient and is a doubt for Saturday's visit of Luton.

O'Driscoll told BBC Radio Sheffield that Roberts' injury was a concern because of a lack of cover in defence.

"Obviously with the centre-half situation we're a bit worried and we'll just have a look at it," he said.