Amid claims of Arbeloa not rating the England fullback, the Real coach was full of praise for Alexander-Arnold after Saturday's victory.
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He said, "Trent is an absolute top player who has returned to his best form.
"That doesn't surprise me, because he's a very clever player.
"He understands the game incredibly well, his quality, his understanding of the game – he's simply incredible."
The win sees Real Madrid go top of the table, two points ahead of Barcelona, though having played one game more.