PSG are a point behind leaders FC Porto and five ahead of third-placed Dynamo Kyiv with two games remaining. Zlatan Ibrahimovic had a hand in all four goals in the 4-0 thrashing of Dinamo as Alex, Blaise Matuidi, Jeremy Menez and Guillaume Hoarau all found the target.
Ancelotti told the club's website: "This is a great victory, very important to lift us up the standings. It was a good game, especially in the second period. The next meeting in Kiev will be decisive for qualification, it will not be easy but we will prepare well for this game."
PSG took the lead after 16 minutes when Ibrahimovic produced a perfect cross from the right for Alex to turn the ball home from 12 yards. Ibrahimovic was again the provider with a pass from the left on the hour which Matuidi slotted into the back of the net.
Five minutes later, Menez benefited from his Swedish team-mate's supply to make it 3-0 and yet another Ibrahimovic assist saw Hoarau complete the rout 20 minutes from time.
PSG captain and defender Christophe Jallet explained they made more use of the greater space they were allowed after half-time. "We took advantage of the space and that made a difference," he said. "It was a good performance and we are on track for qualification, which is the most important thing."
Goalscorer Matuidi said the most important thing was to take three points and strengthen PSG's position as far as qualification for the next stage of the competition is concerned. "We are now well placed to qualify," he said. "That was the goal."