Grêmio fans received some tough news on Thursday night as the club confirmed that captain and defensive midfielder Arthur will be sidelined for the remainder of the season schedule. The setback is a significant blow for coach Luís Castro, who will now have to reshuffle his midfield plans.

After the team's latest match, medical evaluations revealed a grade-one muscle injury in the rectus femoris of Arthur's right thigh. The club has officially estimated a recovery period of two to three weeks before the midfielder can return to action.

The injury occurred during Grêmio's Copa Sudamericana clash against Palestino last Wednesday at La Cisterna Stadium in Santiago, Chile. Arthur started the match on the bench but was brought on at halftime by the coach. The game ultimately ended in a goalless draw, and the captain's night took a turn for the worse.

Without their leader in the middle of the park, Grêmio faces a challenging stretch of fixtures. The immediate test comes this Saturday, as the squad travels to Curitiba to face Athletico-PR at Arena da Baixada in the 14th round of the Brasileirão. Currently sitting in 11th place, the Tricolor is under pressure to end a frustrating run of more than three months without an away win—a streak that Arthur's presence on the pitch could have helped break.

Looking ahead, the captain is also expected to miss the second leg of the Copa do Brasil fifth-round tie against Confiança in two weeks. While Grêmio holds a comfortable 2-0 advantage from the first leg at the Arena, Arthur's absence will still be felt in such a crucial knockout fixture.

If the recovery follows the most conservative timeline of three weeks, Arthur could be fit to return for the Brasileirão match against Santos on May 23. Until then, Grêmio will need to dig deep and find inspiration from elsewhere in the squad to navigate this difficult period without their talismanic captain.