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The Times say the computer systems have been down for a week at the Old Trafford club and staff have not been unable to access their company emails as a result of a shut-down.
United's network has reportedly been infected by a virus called ransomware and despite the club drafting in technical experts from the National Cyber Security Centre to deal with the situation, there are fears potentially sensitive information could be shared.
Worrying. @ManUtd reveal they are victims of cyber attack. Trying to limit effect. Tomorrow's game unaffected.- Simon Stone (@sistoney67) November 20, 2020
It's said United are ultimately powerless and look set to fork out millions of pounds in order to stop leaks happening, as per the Daily Mail
An official statement from the club on Thursday said: "Following the recent cyber attack on the club, our IT team and external experts secured our networks and have conducted forensic investigations.
"This attack was by nature disruptive, but we are not currently aware of any fan data being compromised.
"Critical systems required for matches to take place at Old Trafford remained secure and games have gone ahead as normal.
"The club will not be commenting on speculation regarding who may have been responsible for this attack or the motives behind it."
The investigation into the "sophisticated" attack is ongoing and at "an advanced stage".
United's games against West Brom and Istanbul Basaksehir went ahead as normal, though there were some administrative tweaks made in relation to those needing to secure entry to the stadium.
Ole Gunnar Solskjaer's side travel to high-flying Southampton in the Premier League at 2pm on Sunday
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