The ex-Super Eagles winger, who is a member of FIFA's Technical Study Group, said that France are the favorites to win the final due to their influential midfielder, N'Golo Kanté.
The Les Blues have progressed to the final of the tournament and are set to meet the victor of the other semi between England and Croatia on Sunday.
"I worked first with him when he was 19 and I've seen an incredible, incredible journey in his career".
"He played at Atletico and won a league title".
"I get criticised again and again but everything is fine".
"We are winning. It's always nice to win and to hear good things about the team, about yourself and everything".
Speaking ahead of Belgium's third place play-off against England on Saturday night, Martinez told the media: "If you ask me 'is he the best in the world?', yes".
He finished top scorer at Euro 2016 with six goals but France lost the final to Cristiano Ronaldo's Portugal on home soil.
Didier Deschamps steered an efficient French team into the World Cup final in Moscow where they will face Croatia, a repeat of the infamous 1998 semi final.
"We have the potential to do something great and I hope we will be able to bring them back the cup".
"We started our dream and now we need to finish it".
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