Rio Ferdinand Expresses Regret Over Man United's Missed Opportunity on Bouaddi

• Rio Ferdinand expressed regret over Manchester United's missed opportunity to sign Ayyoub Bouaddi.
• Bouaddi, a teenager, was signed by Manchester City for £86 million.
• Ferdinand stated he is 'so gutted' about the missed signing.
• Bouaddi has made a significant impact since joining Manchester City.
• Manchester United focused on midfield rebuild during the summer transfer window.