Manchester United midfielder Michael Carrick says it is "disrespectful" to claim the club's players are not trying their best for manager Louis van Gaal. United's Boxing Day defeat at Stoke was their fourth in a row and extended their winless run to seven games. Van Gaal, who says he could quit, was at United's training ground on Sunday. "It is a bit disrespectful when people say the lads aren't trying for the manager," said Carrick. "That hurts us - it's not the type of people we are." The United vice-captain added: "We haven't won games and it is fair enough if people criticise things that have gone wrong on the pitch. "It is a horrible run, and it is a horrible feeling. It hurts badly. "The run we've been on is just not good enough. We can't hide from it, we're not going to hide from it. That is how it is and we all need to be better."