Leclerc was penalised for impeding Lando Norris in the tunnel in Q3 after his team failed to warn him early enough about the fast-approaching McLaren driver.
The penalty dropped Leclerc from third on the grid to sixth, making his life much harder for Sunday’s race, in which he eventually finished in the same position.
Leclerc, who has regularly had bad luck in Monaco, tried to be positive after a disappointing afternoon.
“Yesterday [Saturday] I got the information too late and that of course put us a little bit on the back foot for today,” he said when asked about the penalty by Autosport.
“Of course it’s frustrating. Any weekend like this one anywhere it’s frustrating, at home it’s even more frustrating. But on the other hand that’s where we need to keep our head up.
“The season is long, it’s not the only race on the calendar even though it probably means a bit more than the others. The points are the same, so we need to restart again in Barcelona, hopefully having a great weekend that time.”
Vasseur said the team would try to learn from the communication mistake and ensure that there is no repeat.
“He's been a bit frustrated in Monaco for a couple of years now and yesterday was tough,” said the Frenchman.
Source: Autosport