The Real Madrid striker is set to be farmed out on-loan for the second-half of the season after failing to play a minute so far this term under coach Xabi Alonso.
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Lyon are in contact and regarded as favourites to take Endrick over the New Year.
Asked about the rumours on Friday, Fonseca replied: "I can't comment on the players we haven't signed yet.
"But of course, when it comes to good players, they are more than welcome!"