Lammens left Royal Antwerp for Manchester United on deadline day Monday.
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United legend Rio Ferdinand revealed Courtois sent him a voice message about his fellow goalkeeper after learning of doubts being raised in England.
"He let me know about Lammens because he's a Belgian player, and he was just giving me the heads up as to what he's like," Ferdinand said on his podcast.
"He said he's a huge talent, obviously not experienced yet but he thinks his style will be well-suited to the Premier League as well.
"So that's a recommendation from probably one of the best three goalkeepers in the world, Thibaut Courtois, so I'll take that."
