The forward has been in and out of the Madrid team this season with Jose Mourinho chossing to rotate the 24-year-old with Karim Benzema, yet the Argentina international has still managed 16 goals in La Liga this season.
Consequently, Valdano believes that unless people stop questioning Higuain's value to Los Blancos, the persistent rumour linking the striker with a move to Juventus will soon become a reality.
"Higuain is an outstanding striker and goalscorer," the Argentine is quoted as saying on Cadena SER.
"You can not permanently doubt him because the player may end up getting tired [of it]."
Meanwhile, Valdano believes that Athletic Bilbao's Javi Martinez underlined just why he has reportedly attracted the interest of Barcelona with his performance in his club's Europa League win over Manchester United on Thursday night.
"Javi Martinez is worth €40 million [the midfielder's buyout clause]," he enthused. "There are very few like him in the world, with such mastery.
"But youngsters can wait a while and Athletic is the best place for him to mature."
Another European performance caught Valdano's eye this week; that of Lionel Messi, who became the first man to score five goals in a single Champions League game during Barcelona's 7-1 rout of Bayer Leverkusen at Camp Nou.
"He is the first genius of the century," he argued. "He always puts the group before his individual performance. His voice has a sincere humility.
"His family is key but so are [team-mates] Xavi and [Andres] Iniesta."
Valdano parted company with Madrid last May after losing an alleged power struggle with coach Jose Mourinho.
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