Premier League referees' chief Howard Webb said the match officials' decision to rule out Virgil van Dijk's header during Liverpool 's defeat at Manchester City on Sunday was "not unreasonable."

Liverpool contacted Webb , the Professional Game Match Officials Limited's chief refereeing officer, on Monday to raise concerns about the interpretation of the offside rules after Van Dijk's header was disallowed by referee Chris Kavanagh.

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Andy Robertson was clearly in an offside position when he ducked under the ball, but Liverpool argued he was not in goalkeeper Gianluigi Donnarumma's line of vision and so did not interf

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