Doncaster Rovers are up into eighth after a fantastic run of form ahead of travelling to the Breyer Group Stadium where the league leaders are looking to bounce back from a rare defeat in League Two.
Leyton Orient are now winless in their past three games since Christmas and have seen their gap at the top of the table cut to just two points from eight over the past month.
Orient have now lost three games in League Two after a 1-0 defeat to Northampton Town. They have still won 16 times, but they have now seen two clubs score more goals than their 35 from 24 games.
Doncaster edged past the high-flying Carlisle United last time out, while also beating Rochdale at the end of December. It has seen them move into eighth and just one point behind Mansfield Town in seventh.
Rovers have scored 30 goals in 34 games and their current state of confidence will give them great hope against the league leaders who are in their worst period of form this season.