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The 34-year-old playmaker, who has played for the likes of AC Milan, CSKA Moscow and Botafogo in a career spanning over 17 years, penned a six-month deal with the Primeira Liga side with the option for a one-year extension.
He was announced to the press during a conference last weekend and looked set to play for his ninth club - with the experienced midfielder hoping to represent Japan at the Tokyo Olympics this summer.
But it has emerged that Portimonense were unable to register Honda as they battle against relegation.
In Portugal, a free agent signed after the transfer window needs to have been without a club since October.
Honda, meanwhile, was released from his contract at Brazilian side Botafogo in December, meaning he couldn't be registered to play in Primeira Liga.
Back in January last year, Keisuke Honda penned a deal to sign for Brazilian giants Botafogo and well, he had a special demand in order for the transfer to go through.
As per UOL, Honda asked for an armoured, bulletproof vehicle and security guards for extra protection whilst he is in Rio de Janeiro.
And just three months earlier, after becoming a free agent following his departure from Australian A-League team Melbourne Victory, the Japanese international offered his services to Manchester United on social media.
On Twitter, he wrote: "Give me an offer. I don't need money but I need to play with great team and great team mate!"
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