West Ham defender Daniel Potts has thanked well-wishers for their support after leaving hospital following his head injury scare.
Potts replaced Jack Collison just after the hour mark at the Emirates Stadium, but sustained nasty concussion following a heavy fall after an accidental aerial collision with Bacary Sagna.
The 18-year-old spent Wednesday night in hospital and underwent further scans and tests today, which West Ham announced had brought positive results.
Potts will undergo a period of rest before being allowed to resume light training in the gym.
He told West Ham's website: "A big thank you to everyone for their support and messages. Hopefully I am looking to feeling better over the next few days."
West Ham stated: "The club would also like to thank the London Ambulance Service, the on-site pitch rescue team and everyone at Arsenal who helped in making sure Potts was taken to hospital as quickly as possible."
FIFA president Sepp Blatter had earlier expressed his backing for Potts, writing on Twitter: "Best wishes & quick recovery to @DanPotts03. Concussion in football is a big issue that FIFA is taking very seriously."
Collison believes West Ham will learn some hard lessons from their 5-1 mauling.
The Irons were torn apart by a rampant Gunners side who ran in four goals in the space of 10 minutes at the start of the second half.
The night had started well for the visitors, who weathered early Arsenal pressure to take the lead after 18 minutes when Collison crashed in a 20-yard effort following a corner.
However, Lukas Podolski's fine strike sent the sides in level at the break and Arsenal came out on fire following the restart.
Olivier Giroud clipped the ball home at the near post before Podolski set up Santi Cazorla, while Theo Walcott and Giroud again put the home side out of sight before the hour.
From then on it was a case of damage limitation for West Ham, but Collison feels the squad will use their break from FA Cup action this weekend to focus on putting things right in their next Premier League outing at Craven Cottage.
"We defended well in the first half and created a couple of chances," Collison said. "Then we had 10 minutes of poor defending and when you do that against a team like Arsenal, they are going to cut you open.
"As a team, we know that is not good enough and it is up to us to pick ourselves up.
"The manager has not got to tell us it was not good enough, we know that. We have to get ourselves back up and go for the Fulham game."
West Ham missed the chance to secure their place in the fourth round of the FA Cup this weekend when they failed to see off Manchester United at Upton Park and then lost the replay at Old Trafford with a much-changed side.
Collison, though, feels having some extra time to focus on the challenges ahead over the second half of the Premier League season will see everyone refreshed as Sam Allardyce's men look to consolidate their mid-table position.
"We have had a lot of games lately, so now it will be a chance for the players to recharge their batteries and give the manager a chance to do a bit of work with us on the training pitch," Collison said.
"When we come to take on Fulham in a week's time, we will all be ready and raring to go, looking to put right the mistakes we made at Arsenal."