That is not the case, says Sky Sports, but Real Madrid "will have club representatives in the crowd at Wembley" when England play Spain in the Uefa Nations League on 8 September, with a view to tabling a big-money bid in January.
Real Madrid are still evaluating their options after losing Cristiano Ronaldo earlier this summer, and it appears that Raheem Sterling has been made a top target by Florentino Perez.
Lyon thanked Mariano for his efforts last season and expressed their delight that his performances for the club secured him a move to the champions of Europe.
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Mariano is due to be unveiled by Real on Friday, and could feature in the club's La Liga game with Leganes on Saturday.
Los Blancos' La Liga rivals Sevilla, who were close to signing Mariano before Real Madrid swooped in, are understood to be keen on signing the Spain under-21 worldwide. "I like Borja Mayoral, he doesn't have the experience that others have, but he's a player that appeals to me", Machin said in a press conference on Wednesday.
However, Sevilla will have competition from fellow La Liga outfit Leganes and newly promoted side Real Valladolid.
The reigning European champions had originally looked at signing the 23-year-old 12 months ago when it looked as if Pep Guardiola was ready to sell the goalscorer.
His current contract expires at the end of the 2019/20 season.