The two teams are now together at the top of Group A with four points from two matches.
“It was difficult, we did not play well, the players know that, but one point is better than zero,” Chelsea coach Luiz Felipe Scolari told Sky Sports television. “A 0-0 draw was not a bad result.
“Cluj were confident, they wanted to prove something. Maybe they will have a problem in their next game because they ran for 95 minutes.”