straight to your inboxJohn Barnes says Manchester United are placing too much focus on their attack in the transfer market.United continue to chase Jadon Sancho - or an alternative to the Borussia Dortmund attacker - with time running out in the summer transfer window.Yet Barnes believes the Reds need to change tack and rival Manchester City for Kalidou Koulibaly in defence."Manchester United should look to sign a player like Kalidou Koulibaly, he has all the trademarks of a player they need in