- Michael Oliver and his wife have been offered security support after receiving death threats
- The 33-year-old awarded a contentious penalty to Real Madrid against Juventus
- No English referee will officiate at the Russia 2018 World Cup in the summer
Police have offered support to referee Michael Oliver and his wife Lucy after he awarded a controversial penalty to Real Madrid in the Champions League match against Juventus.
The security agency have also warned social media trolls they could be committing a criminal offence by sending abusive at the couples.
A Northumbria Police spokesperson said: "We are aware of threatening messages being posted on social media. This type of behaviour is completely unacceptable and those writing the messages need to be aware that they could be committing a criminal offence.
"Neighbourhood officers are in touch with the victims in this case to offer them support and ensure any further offences are reported to police."
The Professional Game Match Officials Limited (PGMOL) condemned the threats aimed at the pair while Twitter confirmed that it had removed a series of tweets raged at the couples from its platform.
The 33-year-old referee initially found himself in the firing line as goalkeeper Gianluigi Buffon who furiously protested against the penalty decision was sent off.
Real Madrid won the match with a Cristiano Ronaldo's last-gasp spot kick and the Juventus skipper hit out in a post-match interview after the match.
Buffon said the referee had a "bag of rubbish for a heart" and stood by his claims at the weekend.
In Saturday's Premier League between Huddersfield and Watford, Oliver was fourth official and also took charge of West Ham's 1-1 draw with Stoke at Wembley on Monday.
His wife Lucy, is also a referee, officiating in the Women's Super League and men's non-league matches.
UEFA have also revealed on Monday evening they had offered their support to the Olivers.
A statement read: "Uefa strongly condemns the abuse directed at Michael Oliver and his wife.
"We have been in contact with them to offer our support and we trust the relevant authorities to take action against those individuals who have behaved inappropriately both on and off social media."
No English referee was selected by FIFA to officiate at the forthcoming Russia 2018 World Cup slated for June.
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