Sergi Barjuan has urged Barcelona's players to add greater substance to their style as the stop-gap head coach pointed the way forward in the post-Ronald Koeman era.
The clash with Deportivo Alaves on Saturday may prove to be Sergi's only game as boss of the first team, with Barcelona eager to bring Xavi to the club.
Sergi's regular role is as coach to Barcelona B, and he has had precious little time with the senior stars since Koeman was dismissed on Wednesday, after a 1-0 defeat to Rayo Vallecano .
Barcelona head into the weekend in a lowly ninth position, nine points behind leaders Real Sociedad, albeit with one game in hand.
They have played the same number of games as Real Madrid, who sit six points clear of Barcelona and already have a Clasico win in the bag this season.
Sergi believes Barcelona can get back on track and said in a news conference on Friday: "We have to be united, people have to come to the ground tomorrow.
"The way of playing will not change, but maybe some tactical concepts could provide the solution. The style is non-negotiable."
He added: "Tomorrow we have to win the game because LaLiga is open. We have to recover the idea of vertical football."
Former Barcelona and Spain defender Sergi will be without Ansu Fati for the game due to the teenager's knee injury, but Ousmane Dembele could be involved for the first time this season, with the winger back in training after his own knee lay-off.
Sergi said: "I want to put some joy back into the team and get them enjoying their football again. I need all the players to be plugged into turning this situation around."
Playing a vertical game, which would mean being more direct, would seem an obvious move given the personnel available to Barcelona.
Feeding the ball as early as possible to the experienced and capable likes of Memphis Depay and Sergio Aguero may be the smartest option for a team who have struggled to find an identity since Lionel Messi's move to Paris Saint-Germain.
Barcelona have played fewer long passes (449) than any team in LaLiga this season, according to Opta data, but they have played the most possessional passes (6,364), as well as the most passes in the opposition's half (3,431).
Clearly, they are struggling to find a winning formula with their keep-ball game. This has not been helped by their finishing, with just 15 goals scored from an expected goals (xG) total of 18.7.
While Barcelona have lost their last two LaLiga games, to Real Madrid and Rayo, Alaves have picked themselves up after taking just three points from their opening eight matches and have beaten Cadiz and Elche back to back.
Barcelona have not lost any of their last 20 games at home to Basque opponents in LaLiga (W18 D2) since their 2-1 loss against Alaves in September 2016.
Alaves have kept only one clean sheet across their 16 away games against Barcelona in LaLiga, conceding 53 goals across those games. The shutout came in a shock 1-0 win in February 2000.
Sergi said of his opportunity to lead the Barcelona first team: "First of all, I would like to thank the club for the trust they have placed in me. Secondly, I want to send a big hug to Koeman because we have worked side by side these months.
"I arrive in a complex situation, but we are already working. We will have to look for the opponent's weaknesses and try to break their streak with our game."
Coventry City 2-3 Hull City: Tigers win five-goal thriller to keep play-off hopes alive
Hull City kept their hopes of gatecrashing the Championship play-offs alive with a thrilling 3-2 win over beaten FA Cup semi-finalists Coventry City on Wednesday.
Noah Ohio scored the winner with his first touch after coming on as a second-half substitute as Hull moved within three points of sixth-placed Norwich City with two games to play.
Coventry, meanwhile, saw their own hopes of returning to Wembley Stadium for a second successive play-off final all but ended, as they sit six points further back with three matches remaining.
Three days on from their remarkable comeback against Manchester United, the Sky Blues twice fought back to level things at Coventry Building Society Arena. Jaden Philogene's shot squirmed under goalkeeper Bradley Collins to put Hull ahead 31 minutes in, but Kasey Palmer levelled within five minutes with a stunning free-kick.
Hull went back ahead in controversial circumstances on the stroke of half-time, Liverpool loanee Fabio Carvalho converting from the penalty spot despite replays showing Joel Latibeaudiere's foul on Liam Delap took place outside the area.
Mark Robins' men again dragged themselves back into the game as Bobby Thomas headed Jay Dasilva's cross in just before the hour mark, but it was Liam Rosenior's visitors who found a winner.
Thomas went from hero to villain as his poor back pass sold Collins short, and Ohio got a toe to the ball to score the winner, keeping Hull's hopes of Premier League football intact.
Van Dijk: Liverpool have 'no chance' in title race after derby defeat
Virgil van Dijk conceded Liverpool might be out of the Premier League title race after they suffered a surprise 2-0 defeat to Everton in Wednesday's Merseyside derby.
Jarrad Branthwaite and Dominic Calvert-Lewin scored in either half to give the Toffees their first win over Liverpool at Goodison Park since 2010.
Liverpool struggled to find a way through the Toffees' defence despite dominating for long periods, and the Reds' captain says they will not outlast Arsenal and Manchester City without major improvements.
Speaking to Sky Sports, Van Dijk said: "If we play like today, then we have no chance to consider ourselves in the title race.
"We have to just focus on the next game and that will be a tough one anyway, so we will see.
"We're very disappointed, in so many ways. I think everyone has to look at their own performances. Did they really give everything, and do they really want to win the league?
"We're still fighting and there are still games after tonight, but if we play like we did overall in the game today – not winning challenges and giving the referee a chance to give free-kicks like he did many times, then you have no chance to win the title."
Howe: Newcastle performance in Palace defeat 'way off' Spurs win
Eddie Howe admitted Newcastle United's performance in the 2-0 loss at Crystal Palace on Wednesday was "way off" the one that saw them thump Tottenham in their previous game.
Howe's men hammered Spurs 4-0 in their last match, but they never got close to matching the attacking verve from that outing and a Jean-Philippe Mateta double condemned the Magpies to defeat at Selhurst Park.
Newcastle didn't even manage a shot on target until the 87th minute, accumulating just 0.42 xG (expected goals) as the likes of Alexander Isak and Anthony Gordon struggled to make an impact.
Only against Manchester City in August (one) have Newcastle recorded fewer shots on target in a Premier League game this season than their two against Palace, and Howe was critical of his team's display in the loss, one that all but ends their hopes of finishing in the top four.
"[It is a] bad day for us," Howe told Newcastle's club media.
"I thought we were disappointing today, especially in the first 60 minutes. We were way off our levels against Tottenham and our best levels.
"I thought technically we didn't deliver a good performance, and out of possession I don't think it was a particularly good performance either."
Newcastle were unlocked twice for Mateta to score by a Palace side who themselves only generated 0.88 xG.
Howe was left frustrated by the manner in which his side conceded, adding: "I think we'll be disappointed with our performance technically today, and that's probably epitomised by the two goals where we're disappointed with how we've given them the ball in those situations and then how we defended.
"I think the goals sum up aspects of our performance where there was some good, lots of moments that could have led to opportunities, but we were slow to shoot around the box," he said.
The defeat, combined with Manchester United's 4-2 win over Sheffield United, means Newcastle drop to seventh, while eighth-placed West Ham are two points behind with a game in hand.
Newcastle have now lost eight of their last 11 Premier League away games, while they have lost on four occasions in London in the league this term, only doing so more times in a Premier League season in 2000-01 and 2005-06 (both five).
It's been a disappointing season for Howe and his side, especially compared to the heroics of last term when Newcastle finished in the top four, and the Magpies boss knows there's work to be done to get back to those levels.
"It's a day that we have to take our punishment, deal with it, and then try and improve," Howe continued. "It's frustrating because we know we're capable of much better."
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