The Valencia defender, 30, spent three years with Watford before leaving in 2020.
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However Foulquier was subbed off inside 33 minutes of his Premier League debut with the Hornets 5-0 down to Manchester City.
He made just five Watford appearances, and was loaned out three times.
Paris-born Foulquier has now played a major role in sci-fi superhero film Nonm, which has just been released in Guadeloupe and Martinique.
The right-back said: “I play the best friend of the main character, Nonm, which is the Creole word for ‘man.’
“The film has a bit of science fiction and a bit of French-Caribbean culture. There is a super-hero, action and special effects.
“It is my first film, and I found it difficult to express emotions I did not feel – but it was a learning experience for me.
“It was important for me to make the film with people I got on well with.
“I took part during my holidays in Guadeloupe, and didn’t miss any Valencia matches.
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“The project interested me. I feel very close to Guadeloupe culture and its food, music and language.
“I grew up there, and visit every year. I liked the idea of making a film on the island with local people.
“It may come in for criticism, but I am happy with the final result.
“I love football too much to give it up – even if Denzel Washington offered to make a film with me.”
Capped 43 times at youth level by France, Foulquier made two senior appearances for Guadeloupe.
He has also played for Rennes, Granada, Strasbourg and Getafe.