The 25-year-old's impressive performances saw him called up to the England squad by Gareth Southgate and he played a key role in helping the Three Lions reach the semi-finals of the World Cup before Wednesday's dramatic 2-1 defeat to Croatia.
The Algerian posed for photographs before taking a seat and answering questions about his move to the Etihad Stadium.
"I think City will prioritise the Premier League this season, but also look to do really well in the Champions League as well, especially after the disappointment of losing to Liverpool". It's a goal. Now we have to work and see what can happen.
He said: "They (City) offered and Leicester rejected the offers, but it's the past".
Mahrez is pleased to have finally become a City player after the controversy of his collapsed move in January. But Leicester is a good club as well, so it's him, he'll have to decide and see'.
He said: "We are different players - I was a playmaker and he is a winger who can play on the right or the left". I thought what City did a year ago was awesome, it was unbelievable to break all those Premier League records, but I am confident about myself.
'Of course he deserves to play higher.
Meanwhile Birmingham City manager Harry Redknapp predicts that Leicester will have a hard time holding onto Maguire this summer and that he reminds him of former Ireland defender Richard Dunne. "It's a Champions League team, who wants to win trophies every season". Now I'm here and I'm happy. This is the past and we are looking forward now.
Maguire has shown the requisite mental strength to play in the big games for his country and that would be easily transferred into the top of the table and Champions League clashes.
"The most important thing is I'm here".
"I think he will do very well and the thought of Leroy Sane on wing and Riyad Mahrez on the other is very exciting - he will give Pep Guardiola more options in attack and it will be interesting to see the various attacking combinations City can use".
"That's why I'm here, why I made the decision to come here, because I want to be part of this". "It's a good thing".