Chelsea goalkeeper Petr Cech says Manchester United will crack under the strain of going for a clean sweep of trophies this season.
Cech said: "It's hard when you want to win every competition - we know because we have gone close before.
"You can have a bad day and sometimes it's not even that, it's just bad luck. Sometimes you hit the woodwork three times and then concede at the other end and you're out of a competition."