The Australian midfielder has not featured for the Villains since March 4 and Lambert believes it is a good sign that he is very unsettled as a substitute because it means he is desperate to play.
Lambert admitted that Holman was being kept out of the team by French winger Charles N'Zogbia but indicated he could be a chance for the weekend's home meeting with Fulham after returning to full fitness after a slight injury.
"I've spoken to him (Holman)," Lambert told the Birmingham Mail.
"I had a good chat with him, he is an experienced player and has done really fine since he's been here.
"You don't want people to sit and be happy when they are not in the side. You want them to be unhappy."
Lambert added: "He couldn't get in because Charles was playing extremely well.
"He wasn't fit for the other week.
"He is fit now. He has trained this week so he is back in the fray.
"I've got to pick a team that can win a game. That's the only reason."