Arthur has swapped Juventus for Liverpool in a surprising season-long loan deal on transfer deadline day as Jurgen Klopp bolstered his midfield options.
Reports suggested the deal for the 26-year-old did not include an option to buy, but Juve confirmed that there is indeed a possibility for Liverpool to make the move permanent.
Arthur spent two years at Barcelona before moving to Serie A in 2020 in a €72million deal, but he made just 11 league starts in Italy last season and has not yet featured this term.
The Brazilian had previously been linked with Everton but instead joins the Toffees' city rivals for the rest of the season.
The deal follows Juventus signing Leandro Paredes on loan from Paris Saint-Germain, and means a fringe figure can be shuffled out of Massimiliano Allegri's large squad.
Liverpool have been struggling with injuries in midfield, and Arthur, albeit no stranger to an injury himself, adds to their options in that department.
The former Gremio player is a Brazil international who will be hoping to impress at club level to earn a place in Tite's World Cup squad.
Speaking to the club's website after the announcement, Arthur, who will wear the number 29, said: "I'm really, really happy to be here wearing this great shirt with this famous badge that represents so much in world football, it's a dream.
"We talked a lot, and our ideas and visions were a good fit so I'm sure it was the right choice. I'm really happy and highly motivated to continue living my dream on the pitch and giving my all in a Liverpool shirt."
He will be expected to add bite as much as flair to the Liverpool midfield, where he will provide cover for an area where Klopp has seen several players fall to injury already this season.
Thiago Alcantara, Naby Keita and Alex Oxlade-Chamberlain remain sidelined, while Jordan Henderson came off with a hamstring issue in Wednesday's 2-1 win against Newcastle United.
Al-Khaleej 0-1 Al-Nassr: Ronaldo misfires on return as Laporte nets winner
Cristiano Ronaldo returned from suspension but failed to find the net as Al-Nassr secured a 1-0 win over Al-Khaleej on Saturday, with Aymeric Laporte coming up with the decisive goal.
Ronaldo was in action for the first time since being sent off for an elbow in a 2-1 Saudi Super Cup loss to Al-Hilal earlier this month, with his initial two-match ban being reduced to one on appeal.
He missed three good chances as Al-Nassr threatened to fall further behind runaway Saudi Pro League leaders Al-Hilal, but former Manchester City defender Laporte spared his blushes by nodding Marcelo Brozovic's deep free-kick into the bottom-left corner with 68 minutes gone.
Al-Nassr remain nine points adrift of Al-Hilal at the summit in spite of their win, with Jorge Jesus' team unbeaten through 28 games this season as they close in on a record-extending 18th title.
Data Debrief: Ronaldo misfires on return
Ronaldo was presented with the Saudi Pro League's Player of the Month award for March ahead of kick-off, having scored four goals in three league appearances last month.
However, his sights were off on Saturday as he failed to net despite three of the visitors' four big chances, as defined by Opta, falling his way. He led all players on the pitch for expected goals (1.27 xG), shots (five), shots on target (three) and touches in the area (nine) without reward.
Juventus 0-0 Milan: Goalless draw ensures Rossoneri retain grip on second
Juventus and Milan played out a 0-0 draw at a sold-out Allianz Stadium in Serie A on Saturday, with both sides still seeking to secure Champions League spots for next season.
Midfielder Filip Kostic and striker Arkadiusz Milik had great chances to give Juventus the lead in the second half but Milan goalkeeper Marco Sportiello showed off his skills to keep their attempts out.
The Rossoneri finished the game without a shot on target as the contest finished goalless, leaving the sides to share the spoils.
Milan remain second in the standings on 70 points while Juventus remain third on 65, after Inter sealed the title on Monday.
Huddersfield all but relegated from Championship while League Two play-off spots decided
Huddersfield Town saw their relegation from the Championship all but confirmed after a 1-1 draw with fellow strugglers Birmingham City on Saturday.
The Terriers avoided a defeat that would have seen them relegated on Saturday, but even a win on the final day over promotion hopefuls Ipswich Town will not be enough unless they overcome a huge goal difference of 15 goals with Plymouth Argyle.
Birmingham remain in the other relegation place and now must beat Norwich City to stand a chance of staying up with Sheffield Wednesday, Plymouth and Blackburn Rovers also still in danger.
At the other end of the table, the Canaries dropped points in a 2-2 draw with Swansea City, leaving the door open for Hull City, who face Ipswich Town later today.
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