Pep Guardiola looked to be fuming in the aftermath of Manchester City's loss to Newcastle United (Image: Getty Images)

Alan Shearer has claimed that Pep Guardiola should stop worrying about 'refereeing decisions and bad luck' and concentrate on his team's issues at present.

Newcastle United secured a convincing 2-1 win over Manchester City at St James' Park on Saturday evening, in a game that wasn't without its fair share of drama. Harvey Barnes opened the scoring for the Magpies 64 minutes into the match, before Ruben Diaz levelled matters four minutes later.

Barnes then gave United the lead once more in the 70th minute, but his second strike came in seemingly controversial fashion. Bruno Guimaraes appeared to be in an offside position when his headed effort bounced off the

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