Chelsea manager Frank Lampard made a mistake in allowing midfielder Ross Barkley to join Aston Villa, according to Paul Merson.
On Wednesday, Chelsea confirmed that Barkley had joined Villa on a season-long loan.
Having fallen behind Mason Mount and Mateo Kovacic on the depth chart, the England international was allowed to leave as he seeks more minutes ahead of the Euros next summer.
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Merson, though, believes that Lampard is playing a "dangerous game" by letting Barkley leave, believing the 26-year-old can become a "superstar" at Villa Park.