Skipper Brian Stock could make his first appearance for Doncaster Rovers since being sidelined by an ankle injury in September.Martin Woods has returned to full training after a groin problem, but Adam Lockwood has still not completely recovered from a foot injury. [LNB]Watford include striker Heidar Helguson in their squad. [LNB]Helguson, who has returned for a second loan spell from QPR, is fit again after recent injury problems. [LNB][LNB] MATCH PREVIEW Earlier this week it seemed like Doncaster were going to lose manager Sean O'Driscoll to Premier League club Burnley.[LNB] [LNB][LNB] But the Clarets' appointment of ex-Sheffield Wednesday boss Brian Laws means O'Driscoll remains at Rovers, where his reputation has been further enhanced by their recent run. [LNB]Doncaster, whose last three fixtures have been postponed, have won seven of their last eight matches and are well on course to defy the doubters who believed they could struggle to stay in the Championship this season. [LNB]The inexperienced Malky Mackay also had his doubters when he took over as Watford boss in the summer. But the Hornets are in touch with the play-off places and have been boosted by the news that fans' favourite Heidar Helguson will stay on loan at the club for the rest of the season. [LNB][LNB] MATCH FACTS Head-to-head[LNB]• Watford are unbeaten in their last five matches against Doncaster. [LNB] Have your say on this match • The Hornets have won seven of the 14 previous league meetings between these clubs and are vying for a third successive away victory against Rovers. [LNB]Doncaster[LNB]• Doncaster have conceded one goal in their last five games, four of which were won. [LNB]• They have committed fewer fouls than any other club in the division (212), and picked up fewer cards (three red, 21 yellow). [LNB]Watford[LNB]• Watford have drawn their last two league games, and failed to win six of the last seven. [LNB]• The Hornets have conceded eight goals in the first 15 minutes of Championship games this season - more than any other team. [LNB]• Watford and Nottingham Forest are the only clubs not to have scored a penalty in the Championship this season. [LNB][LNB] MOST RECENT MEETING Watford 1-1 Doncaster (8 August 2009) [LNB]Watford scorer: Graham 27. [LNB]Doncaster scorer: Hayter 38.