Arsenal faced fierce criticism for not replacing David Luiz immediately after colliding with Raul Jimenez, which occurred just five minutes into the Premier League match with Wolves at the Emirates.
Premier League: Arsenal manager Mikel Arteta backs calls for concussion substitutes, defends club doctor's actions
Luiz played on until half-time of Sunday's match, with Arsenal insisting concussion protocols were followed, but was replaced as blood continued to seep through his head bandage.
Jimenez received 10 minutes of treatment on the pitch after the clash of heads in the first-half of Sunday's Premier League match at the Emirates Stadium. He was subsequently wheeled off the pitch and taken to hospital.
Premier League: Ederson calls for concussion substitutes in aftermath of Raul Jimenez, David Luiz's clash of heads
Wolves striker Jimenez was immediately taken to hospital after the incident early in Sunday's 2-1 win at Arsenal, but Luiz played on for the remainder of the first-half before being replaced at half-time.
Wolves — who won the game 2-1 for their first win at Arsenal in 40 years — said Raul Jimenez would remain under observation for a few days.
Premier League: Wolves' Raul Jimenez 'conscious, responding to treatment' after clash of heads with David Luiz
Jimenez received treatment from medics for 10 minutes on the pitch after colliding with David Luiz before being stretchered from the field early on in the game.
Premier League: Liverpool set new Anfield record with win over Leicester; 10-man Arsenal hold Leeds United
Liverpool have now set a new club record of 64 unbeaten league games at Anfield.
Arsenal boss Mikel Arteta did not reveal if Willian will be dropped for Sunday's Premier League trip to Leeds.
Europa League: David Luiz makes injury comeback ahead of Molde clash as Mikel Arteta seeks to rotate squad
Arteta initially feared that Luiz would be out for "a few weeks" but the 33-year-old has resumed training and is available for selection.
Premier League: Arsenal's Granit Xhaka repaying coach Mikel Arteta's faith with remarkable turnaround
Arteta has instilled a new team ethic at Arsenal and Xhaka has clearly bought into it — working tirelessly in front of his defence at Wembley on Saturday to help keep City at bay.
Luiz, whose contract was due to expire at the end of the month, took the blame for a 3-0 loss to Manchester City on 17 June when the Premier League resumed following the coronavirus stoppage
Having come on as a 20th-minute substitute, Luiz was sent off in loss at City and is suspended for ninth-placed Arsenal’s trip to Brighton & Hove Albion on Saturday and the game at Southampton on 25 June.
Arsenal’s Brazilian defender David Luiz blamed himself for his team’s 3-0 defeat at Manchester City on Wednesday in which he was sent-off in the 49th minute.
Premier League: David Luiz sent off as Manchester City outclass Arsenal; Sheffield United denied by technology
Raheem Sterling scored the first goal of the Premier League’s return to action after the coronavirus lockdown as Manchester City defeated Arsenal 3-0 behind closed doors at the Etihad stadium on Wednesday.
Coronavirus Outbreak: Alexandre Lacazette, David Luiz among players spotted in action as Arsenal reopens training ground
France striker Alexandre Lacazette, Brazil defender David Luiz and Switzerland midfielder Granit Xhaka were seen arriving at the Arsenal facility, which is situated 20 miles north of London
Premier League: Tenth-placed Arsenal's manager Mikel Arteta says he isn't expecting 'big things' in transfer window
After investing heavily in the close-season to secure the likes of Nicolas Pepe, David Luiz and Gabriel Martinelli, British media reported Arsenal are working with a modest transfer budget this month.
Premier League: Pierre-Emerick Aubameyang inspires Arsenal to special win as Paul Pogba's absence hurts hapless Manchester United
Paul Pogba’s absence was as telling in Arsenal’s 2-0 win over Manchester United as Pierre-Emerick Aubameyang’s presence.
Premier League: Frank Lampard's Chelsea exploit Arsenal's anxiety to script late comeback victory against London rivals
Arsenal conceding two late goals in quick succession to their bitter city rivals turned the bugle blow for a new era at the Emirates a screeching, panning klaxon of all the qualities they lack.
Premier League: Mikel Arteta's pragmatic Arsenal against Frank Lampard's attacking Chelsea will be chess vs checkers
Arsenal welcome Frank Lampard’s exuberant, unpredictable young side at the Emirates tonight hoping to close the gap in league table and under the tutelage of Arsene Wenger and Pep Guardiola’s protege, Mikel Arteta incrementally restore their lost stature.
Europa League: Arsenal, Manchester United gunning to make knockout phase as dismal Premier League campaigns continue
Ole Gunnar Solskjaer's United registered a 1-0 win in Belgrade a fortnight ago and are one of just two clubs yet to concede a goal in the competition