Angel di Maria says friendships will go out the window when his Manchester United meet Manchester City.
Di Maria is one of five Argentines likely to start at the Etihad and having shared together a World Cup that came agonisingly close to ultimate glory, he believes a few handshakes can be forgiven.
"When we see each other in the tunnel before games, I think it's right to say 'Hi' and greet each other - whether it's an ex-team-mate or a good friend," he told the Daily Mail.
"I think that's normal, as long as you remember that you fight for the club and the shirt once the 90 minutes start. We must all remember there are no friendships out on the pitch."
