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1. Attack winger-turned-left-back Andrés Guardado
Guardado is guaranteed to start at LB, with Aly Cissokho and Jérémy Mathieu out injured.
Andrés doesn't move, think or react like a defender—the sad reality is that he's performed better in defence than as a winger.
Ángel Di María, who hadn't scored and only created one goal in his last 10 games going into the match vs. Los Che, dismantled Guardado during Real Madrid's 5-0 win.
Zonal Marking's Michael Cox was blunt about the Mexican's defensive prowess: "Guardado has coped well at left-back in recent weeks, but is plainly not a natural there, and Di María exploited his lack of quality."
2. Hit Valencia on the counter
According to WhoScored, Ernesto Valverde's side are "very weak" in defending counter attacks, as evident in the embarrassing loss to Los Blancos.
It's an issue that plagued Valverde's predecessor, Mauricio Pellegrino, who admitted the team's propensity to shoot themselves in the foot after losing to Bayern Munich (via ESPN FC): "We had no support when we brought the ball out, and we were not in the right positions. We gave the ball away a lot, especially in the first half. You are going to pay dearly for errors."
The 5-2 loss to Real Sociedad at home sealed Pellegrino's fate, and it was a game that highlighted Valencia's defensive breakdowns.
From a Los Che corner, the Sociedad defender's headed clearance fell to Carlos Vela, who carried the ball deep into Valencia's half untouched.
He threaded a pass to Antoine Griezmann, whose shot was saved by Diego Alves' legs, and grazed the crossbar.
Ricardo Costa then gave the ball away leading to Diego Ifrán scuffing his shot from a 1-on-1 situation.
It took the Txuri-urdin 13 seconds to score after a meek Fernando Gago shot.
Keeper Claudio Bravo made the save, then accurately found Vela with a long pass, who clipped the ball over João Pereira and Ricardo Costa, to which Ifrán raced through and scored.
Ernesto is aware of PSG's counter attacking style (from Reuters via SBS.com.au): "PSG are more similar to Madrid than to Barcelona. They are a team who have good players up front, who don't mind sitting back and who attack with speed."
3. Force Valencia to Self-Explode
You'd have to include Valencia among the likes of Espanyol, Atalanta, Stuttgart, and Sevilla as teams that self-explode when the going gets tough.
Los Che have the third most yellow cards in La Liga and lead the league in unprofessional bookings.