However, Everton's price is a concern for the Blaugrana.
Sport says Onana is among Barca management's favourites to reinforce the midfield, but his price, which amounts to 60m, makes his signing complicated.
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Barca also are pushing for Guido Rodriguez, who would arrive for free with his contract ending at Betis.
For their part, Everton may seek a quick sale due to financial issues.