The England midfielder and Holland defender are important figures for Villa down the spine of their side and everyone connected with the club will be hoping that their injury problems are now behind them.
Philippe Senderos is another of those to have spent a frustrating amount of time in the treatment room, with an early-season problem followed by a hamstring complaint picked up while away with Switzerland.
Lambert was left fuming with the Swiss FA after learning that the defender had been crocked, but is now ready to bring him back into contention.
The Scot admits those returning from injury have offered a timely boost to his plans, but he also acknowledges the need to dip into the January transfer window and add greater depth to his squad.
He said after Saturday’s 1-0 derby defeat to West Bromwich Albion: “I don't think we have the strongest (squad depth), but we've got Fabian back and (Philippe) Senderos is close but I think you are always trying to improve the quality and squad size.”
Lambert could do with some fresh faces now, with Villa set to take in five fixtures in the space of three weeks.
They will be hoping to use that hectic schedule to move them into the top-half of the Premier League standings, but will also be aware that it could drop them back into trouble.
Having the likes of Vlaar and Senderos back should aid their cause, with Villa’s defensive unit starting to look a lot more solid with their considerable experience at the heart of it.