His previous deal expired on March 1, and he can now boost his annual income by nearly 30 percent.
Uniqlo lost Novak Djokovic to Lacoste in 2017.
According to reports coming out of Switzerland, the 20-time men's singles Grand Slam victor is on the verge of agreeing a lucrative new deal with Japanese sportswear manufacturer Uniqlo. However, the one sticking point is that Uniqlo do not make sports shoes, meaning Federer would have to seek another footwear company too.
Roger Federer hasn't played a competitive match since March, and he's itching to get back on court.
Federer, who arrived at Stuttgart for the Mercedes Cup at the start of the week, confirmed his deal with Nike had concluded but rubbished reports suggesting he already signed up with Uniqlo.
Federer continued to wear Nike t-shirt, shorts, trainers and headband as he trained at the Stuttgart Open on Monday.
He also made the 2011 final but, after a stunning return from injury to win his first Grand Slam title for five years at last year's Australian Open, Federer has steered away from clay to protect the knee on which he had minor surgery in 2016.
According to Association of Tennis Professionals (ATP), if Nadal wins the 2018 French Open, he will be the first ever player to win 11 titles in three different tournaments.More news: Ronaldo's Portugal arrive in Russian Federation ahead of World Cup clash against Spain
Djokovic left the partnership to join Lacoste previous year.
A well-disguised drop shot served him well at 30-40 down in game three but in opting for power soon afterwards he netted a forehand, affording Nadal another break chance that was gobbled up.
For 24-year-old Thiem, playing in his first Grand Slam final, it was a deflating defeat for the only man to have beaten the Spaniard on clay in the last two years.
Rafael Nadal winning his 11th title at Roland Garros on Sunday, June 10 marked the end of the clay-court swing this season. "So, yeah, I just went straight to my chair because I went - I didn't know even what I did".
"If you don't have the will to improve, you don't understand the sport, because the sport is always about improving".
"It's a dream to win 11 times", Nadal said. Nadal's uncle and longtime former traveling coach Toni - who returned to watch his nephew Sunday - said essentially that only time will tell whether Federer can be caught.
"I have never been insane about this kind of stuff, you can't always be frustrated if somebody has more money than you, a bigger house than you, if somebody has more Grand Slams than you, ' he said".