Johnson, a former MEP, told French radio station RTL that he “will always be European” in an interview aired on Thursday.
“It’s not about becoming French. If I understood correctly, I’m French,” he told RTL in French, highlighting his family’s link to the country.
“My mother was born in France, her mother was completely French like her grandfather. So for me it’s about getting back what I already have,” he said of the decision to become a French citizen. “So I’m very happy.”
Britain officially leaves the EU single market and customs union when the transition period ends at 23:00 GMT (18:00 ET) on New Year’s Eve.
Stanley Johnson insisted that Brexit will not mark the end of European identity for him or the English people. “I will always be European, of course. You can’t tell the English, ‘You’re not European,'” Johnson told RTL.
“Europe is always more than the common market, it is more than the European Union,” he added. “But yes, yes, it’s important to have that link with the European Union.”