Italy's maverick 5-Star Movement should cut ties with the anti-European Union U.K. Independence Party (UKIP) and consider hooking up with the Liberals in the European Parliament, 5-Star founder Beppe Grillo said on Sunday.

If the surprise switch goes ahead, it would see 5-Star enter mainstream European politics and move away from the anti-system fringes, a shift that might reassure other EU capitals that have grown uneasy about its rising popularity.

Writing on his blog, Grillo said his party was in talks with the Alliance of Liberals and Democrats for Europe (ALDE) and asked 5-Star members to back the initiative in an online ballot.