Allan sees himself long-term at Everton.
The midfielder is in his second season at Goodison Park.
He told evertonfc.com: “I've always loved watching football and always followed the English game and I think that helped me adjust.
“All the help I received from my teammates and everyone who works here at Everton, everyone who made me so welcome, has been great for me and my family.
“I was excited about a new adventure – for my wife and children, as well as me – but it has been an even better experience than I expected.
“And it keeps getting better. It is wonderful to play at a full Goodison Park, our fans are incredible, you feel their passion and it makes you want to give everything for them.
“We can also see more of the city and the area where we live and this adds to the fantastic experience.
“Everton is a great football club. I want to be here for a long time and make my name as part of a team that brings success for the supporters and the people who work for the Club."
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