Sergio Aguero’s hat-trick all-but secured Manchester City’s place in the group stages of the Champions League - and Pep Guardiola has assured the Argentine that he will remain his first choice penalty-taker despite missing two spot kicks in the 5-0 win against Steaua Bucharest.Aguero could have doubled his scoring in a stunning attacking display from City.He recovered from seeing Florin Nita save his first penalty and then firing over with a second attempt from the spot.It’s claimed a laser pen was shone in his eye for one of the kicks - but either way, Guardiola made it clear he still has faith in his star striker.‘I am confident if Aguero is confident and as far as I am concerned he is still taking the penalties,’ said the City manager.Yes, he missed two penalties, but after the first he wanted to take the second and I like a player who stand up to that responsibility.‘I like that he believes he has that power.‘I will leave it up to the players, but I am happy to let him carry on but I will leave it up to the players for the next one.’David Silva and Nolito were also on target in the first leg of City’s qualifying game against Steaua.The Romanians will travel to Etihad next Wednesday for the second leg, but City’s progress to the group stages is now a formality, with Guardiola adding: ‘The result was amazing and the way we played was so satisfying.’