In the men's under-66 kilograms category, the world numbers one and two lead the field.

An Ba-ul of South Korea - a two-time Olympic medallist and the 2015 world champion - is due to be in action, with world number two Denis Vieru of Moldova - a world bronze medallist from 2019 - also entered.

Belgian Matthias Casse is the top seed in the men's under-81kg, fresh from his World Championship gold medal last year in Budapest and an Olympic bronze medal won in Tokyo.

Portugal's Jorge Fonseca is the top-ranked judoka in the men's under-100kg, coming off the back of a world title and Olympic bronze too.

Francisco Garrigós of Spain, who won bronze at the World Championships in the men's under-60kg, is also a top seed, in front of two-time Grand Prix medallist Artem Lesiuk of Ukraine.

Fabienne Kocher of Switzerland is a bronze medallist from last year's World Championships in the women's under-52kg and goes in as top seed, but fourth seed Distria Krasniqi of Kosovo could be considered the favourite as a reigning Olympic champion.

Another home favourite, Telma Monteiro, is the first seed in the women's under-57kg and one of the most decorated athletes at the Grand Prix this weekend.

She is an Olympic bronze medallist, five-time world medallist and five-time European champion, including last year in her home nation, where she will be looking for more success.

European champion Beata Pacut of Poland headlines the women's under-78kg category.

The next three seeds are just behind her in the rankings from ninth to 12th - Inbar Lanir of Israel, Ukraine's Anastasiya Turchyn and South Korean Yoon Hyun-ji.

The Portugal Grand Prix is scheduled to start tomorrow, ending on Sunday (January 30).