Jose Mourinho has urged his Manchester United players to show their love for the club and help overcome their difficult start to the season.
Although Mourinho's men won their first game of the competition, against Young Boys, they have not won any of their three matches since, having been held to draws by Wolves and Derby County, with the Championship side winning the Carabao Cup tie on penalties, before Saturday's 3-1 defeat at West Ham.
As reports of problems in the dressing room continue to circulate, the pressure is growing on Mourinho, but he is demanding a better attitude from his players.
"I prefer to say that the players’ attitude is the most important thing and then from the supporters I cannot ask for any more," he told United's official website.
"I cannot ask for more than they are giving at home. Away with bad results, I cannot ask for more. I think it’s time for the people on the pitch to show them [the fans] that they love the club as much as the fans."
However, Mourinho knows they are capable of much more.
"It’s a difficult game, we have to win if we want to be in a fantastic position and we shouldn’t lose if we want to stay at least in control of our situation,” he added.
"[Valencia are] a good team with a very good squad, a very balanced squad with two players per position of [a] high level. [They] have a way to play based on the power and strength of two central defenders and the quality and speed, especially in the counter attack in the wings and the strikers, so a difficult opponent.
"What I expect is exactly that – a team that in this moment has zero points [in the Champions League] but zero points from a match against Juventus. They know that they have a double fixture next against Young Boys, where I’m pretty sure that they think they can get six points in this double fixture, but they will try at Old Trafford to take something from the game.
“A counter-attacking team, a very strong counter-attacking team. They defend a lot with two lines of four, very compact, and, as I was saying, central defenders like [Ezequiel] Garay with that stature, experience and physicality and then, from Rodrigo, [Michy] Batshuayi and [Kevin] Gameiro, two of them are playing. They are very direct in the counter attack and are a dangerous team.”