After several weeks of haggling and doubt, the Spain defender signed for Athletic last week from Al-Nassr.
Advertisement
Advertisement
It means Laporte returns to Athletic since his sale to Manchester City in 2018.
He said, "I'm so happy to be with you. Today is a big day for me. We're expecting an exciting season, and I can't wait to play and help the team at San Mamés.
"It's everything I've ever wanted. Thank you so much for your support."
Now 31, Laporte has penned a deal to 2028.