Maldonado will race for the Enstone based team next year after three seasons with Williams.
Boullier has previously worked with Maldonado, as the Venezuelan raced for DAMS in the 2005 World Series by Renault championship.
"He's a friendly guy, he's a fast guy. He won a race in Formula 1 and it was on merit - it was not gained from some lottery," Boullier told Sky Sports F1.
"I think we just need to make sure he can keep his focus - actually similar issues we had with Romain [Grosjean] last year - keep his focus on track."
"I'm sure that with the proper support and team around him, we can do something nice with Pastor. Maybe there is still some fine-tuning to do with him. And I think one the most important parts, having talked to him already, is obviously feeling the support of the team behind him."
Boullier conceded that Lotus's move for Maldonado was partly financially motivated and insists that their prospective deal with Quantum Motorsports can still happen.
"We are still confident something is going to happen. But timing is an issue. Obviously there is a financial support with Pastor, which in these days we may need. And unfortunately, as I said before, timing is an issue."
"Even if [team owners] Genii is deeply involved in funding the team, there are some solutions that need to be done. And it's true that Quantum Motorsports is the best one we can have but timing is everything, especially in Formula 1."
"We have to deliver a car in less than eight weeks now."