Musonda spent the second half of the previous campaign at the Spanish outfit and looks set to go on loan again.
He said: "We decided to give him another campaign over there where he had a great performance - then you are ready to return," De Visser told Belgian magazine Knack.
"Charly has made an excellent choice [to go to Betis]. When we took him he was very frail.
“We even feared that he was too little athlete despite his talent to make it in the sport."
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