Manchester United have made an amusing response to Pep Guardiola's bizarre claim that he will always be a 'failure' at Manchester City because his idol Julia Roberts once visited Old Trafford instead of the Etihad.

Pep Guardiola hilariously insisted that even three Champions League trophies wouldn't be enough to make his time at City a success - because his side were once snubbed by Roberts.

The manager was unsurprisingly in good spirits after his side thrashed RB Leipizig 7-0 (8-1) to ease into the quarter-finals on Tuesday night.

Guardiola revealed that Roberts is one of his three idols, alongside golf legend Tiger Woods and NBA all-time great Michael Jordan, and subsequently admitted his disappointment that the Hollywood star chose to visit United's ground instead of City's when she travelled to England in 2016.

'Julia Roberts years ago came to Manchester - not in the 90s when Sir Alex (Ferguson) was winning titles and titles and titles,' he said in his post-match press conference. 

Pep Guardiola joked he will always be a failure at Manchester City because his side were once snubbed by his long-time idol Julia Roberts

Manchester United shared this tweet in response to Guardiola's bizarre claim on Tuesday

'She came in the period where we were better than United, in these four or five years, right?

'And she went to visit Man United. She didn't come to see us. That's why even if I win the Champions League it will not compare for the fact that Julia Roberts came to Manchester and didn't come to see us.

'Even if I win the Champions League it will not compare to this disappointment I had.'

And United have been quick to poke fun at the City boss with a post on social media.

'Throwing it back to when Julia Roberts visited Old Trafford,' they wrote on Twitter with a smug emoji, accompanied by a set of pictures of Roberts clearly enjoying herself on the famous Old Trafford pitch. 

Roberts visited Old Trafford back in 2016 to watch Manchester United face West Ham 

Fns on Twitter enjoyed Man United's response and called for the admin to get 'a raise'

United fans clearly enjoyed the response, with one fan writing: 'Did we change admins recently? Because I've never seen United's admin this witty! 

'This admin deserves a raise,' followed by a laughing emoji.

Another described it as: 'Elite level trolling.'

While a third added: 'Nah this is a huge W, give this admin a raise bruv,' followed by a laughing emoji.