The Belgium international has penned a "long-term" contract at Anfield after passing medical.
The 25-year-old has impressed in the North East since arriving from Sint-Truiden in 2010, establishing himself as one of the most promising keepers in Europe.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? firstname.lastname@example.org