Midfielder Olivier Ntcham says he decided to agree his new four-year contract with Celtic in the summer despite interest from other clubs.
Both Marseille and Porto were linked with the 22-year-old with reports the Scottish Premiership side rejected a £13.5m bid from the latter in August.
However, Ntcham says he opted to stay with Celtic during pre-season.
"I was talking with the manager and we made the decision when we came back after the summer," said Ntcham.
"It took a bit of time, but I'm happy."
Ntcham signed a four-year contract when he was transferred from Manchester City for £3.5m in July 2017 and has since made 68 Celtic appearances - 21 this season - and scored five goals.
Asked about the interest from Porto, he said: "I focus on the pitch. Everything else I leave to my agent and brother. I am just focused on Celtic and not what happens next. That's why I've signed a new deal."
Ntcham, who was born in France to parents of Cameroonian descent, hinted that had decided which international team to represent but says he is in no hurry to make an announcement.
The playmaker has appeared 15 times for the French under-21 side.
"I am playing for the French now and we have a tournament at the end of this season," he said. "When you have to make an important decision like that, you have to take your time. I want to take time."