Liverpool are thrilled to have Arthur on board, but the on-loan Juventus midfielder will not be available against Everton, Jurgen Klopp has confirmed.
Arthur joined Liverpool on a one-season loan on Thursday, with the Reds having an option to buy the former Barcelona playmaker for £32.3million (€37.5m).
The Brazil international did not enjoy much success across the last two seasons in Turin, and had not featured in this campaign after making just 11 Serie A starts last term.
Liverpool had initially suggested their business was complete after the early acquisitions of Darwin Nunez, Calvin Ramsay and Fabio Carvalho, but injuries to Thiago Alcantara, Naby Keita and Jordan Henderson – who will definitely miss Saturday's derby at Goodison Park – forced Klopp's hand.
Despite it being a late deal, Klopp believes Arthur is an ideal solution to Liverpool's needs.
"Everyone was really happy about the transfer. He will not have international clearance but we all hope he will be fine for Napoli [in next week's Champions League tie]," said Klopp in a press conference.
"He's a really good footballer, we all agree on that, really exciting career already and still pretty young, coming to the best age for a footballer and he can give rhythm, he's a really good passer, quick with the ball, safe on the ball, really good in tight areas, all these kind of things, I like it a lot.
"Why can you loan a player like this? Because it didn't work out 100 per cent at Juventus but I see it as a positive because the potential is still there. We play differently to Juve, and we all thought he could fit pretty well, really pleased."
Klopp indicated that Keita would remain out for a sustained period with a muscular problem, though he is hoping Thiago will return to training next week.
Man United could be without Toone until new year, says Skinner
Marc Skinner revealed that Manchester United could be without midfielder Ella Toone until the new year after she picked up a calf injury in training.
Toone has featured in five games in the Women's Super League this season, but is yet to register a goal or an assist so far this term.
The 25-year-old has missed United's last two games and was not selected in Sarina Wiegman's England squad for their upcoming friendlies against the United States and Switzerland.
She had previously appeared in a staggering 96 straight matches before missing United's WSL showdown with Leicester City last weekend.
But ahead of the Red Devils' meeting with league leaders Chelsea on Sunday, Skinner confirmed they would be without Toone for not only that game, but for the foreseeable future.
"We have three games [after the international break and before Christmas]. There's always the hope, but I think you balance and you go, 'right, if we can get her back, we get her back'," Skinner said.
"But we're just not going to rush her in this moment because it's a calf injury, it's your running mechanism. If we injure the running mechanism, it takes longer.
"So ideally we'd like her back for those games afterwards.
"The projection is she misses this game [Chelsea], she misses the international window, probably misses the first game after that, and then we'll see from there.
"But because it is such a short block of only three games, we'll assess whether it's worth that or actually resetting to come back after Christmas."
Al-Nassr 1-2 Al-Qadsiah: Aubameyang winner ends hosts' unbeaten run
Pierre-Emerick Aubameyang hit the winner as Al-Qadsiah inflicted a 2-1 defeat on Al-Nassr in the Saudi Pro League on Friday to end their 21-match unbeaten run.
Cristiano Ronaldo's seventh league goal of the season put Al-Nassr ahead, but Al-Qadsiah replied swiftly through Julian Quinones before Aubameyang struck the decisive blow.
The hosts drew first blood in the 32nd minute when Ronaldo slotted home after Al-Qadsiah goalkeeper Koen Casteels had spilled a routine catch from Talisca's cross.
However, Al-Nassr's joy was short-lived when Quinones brought down Turki Al Ammar's delivery five minutes later, with the Mexcio winger firing past Bento to level the scores.
Quinones also played a part in the winning goal after brilliantly turning the ball back across goal from Nahitan Nandez's search pass to tee up a simple finish for Aubameyang.
The result sees Al-Qadsiah move level on 22 points with third-placed Al-Nassr, with Al-Shabab also level with them.
Stefano Pioli's Al-Nassr are six points adrift of defending champions and leaders Al-Hilal, who also have a game in hand.
Slot: Guardiola contract is 'good news' for Premier League
Arne Slot believes it is "good news" for the Premier League that Pep Guardiola has signed a contract extension with Manchester City.
The Spaniard signed a two-year extension with the reigning champions and will remain in the dugout at the Etihad until 2027.
He has won 18 major trophies in his time at City, including six Premier League titles, and twice beat Jurgen Klopp's Liverpool to the top-flight crown by a single point.
Guardiola averages 2.35 points per game in the Premier League, the highest rate of any manager (20+ matches). Indeed, he is so far ahead of the next highest (Alex Ferguson's 2.16), he could lose his next 26 league games in a row and would still be top.
Slot is yet to face City since taking over from Klopp at the start of the season, with the rivals' first meeting of the season set for December 1.
"It's good news for City and for the league because everyone wants the best managers and the best players over here," Slot said when asked about Guardiola's new contract.
"He is definitely one of the best managers, maybe the best manager of the league.
"He's won four titles in a row, so it's fair to say he's maybe the best manager in the league.
"On the other hand, they have so many quality players that, if he would have made the choice to leave, I wouldn't have expected them to end up bottom of the league next season."
Other Premier League managers echoed Slot's sentiment, with Brighton boss Fabian Hurzeler, who inflicted a fourth consecutive defeat on City before the international break, saying it is the "best thing that can happen to the Premier League".
"He is one of the best coaches in the world," Hurzeler said. "With his ideas, he always brings something new to the football stage, and it is always a challenge to compete against him.
"He always adapts quickly, always has new ideas and he can always win the game. I'm very happy because we can learn from him and to compete with him is a big, big experience."
Newcastle United boss Eddie Howe added: "He's contributed so much to English football. He's revolutionised how a lot of teams play.
"I think he's incredibly talented, and it's good for the English game that he's still here.
"He will continue to develop and evolve his style, and people will potentially continue to follow that. From the competition side, I think it keeps the Premier League as the best in the world."
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