Nico Hulkenberg and Felipe Massa will have to wait a bit longer to learn their fates as Lotus are not yet ready to announce their 2014 line-up.
With Romain Grosjean expected to stay on next season, the world awaits news of who will become the Frenchman's new team-mate.
And as Lotus have the best still available for next year's Championship, many hopefuls for vying for the honour.
Hulkenberg is believed to be leading the running with Boullier recently admitting that the Sauber is his choice. However, Massa is reportedly also chasing the drive while Pastor Maldonado has also been linked to it in recent days.
For now, though, they will all have to wait.
"There are no announcements yet but there is plenty going on behind the scenes," Boullier said.
"We know that Kimi is headed elsewhere for next season, but we also know that Romain would bring good continuity as well as the strong performance potential we've seen recently.
"There are a number of other good drivers on the market at the moment, so we're in a strong position of being able to assess the possibilities.
"A race seat with Lotus F1 Team is pretty hot property at the moment, so we're confident we'll have a strong line-up in 2014."
The team, though, is also looking for a strong finish to this season with the French team boss urging his outfit to grab second place in the Championship.
"If we continue as we have done for the last few races, then mathematically second in the standings becomes a very attainable target.
"Of course, we all know that anything can happen in this sport, but second place would be an amazing result so we'll push as hard as we can and you never know what might happen."