Former England striker Carroll and New Zealand defender Reid have returned home early from a pre-season training camp in Switzerland to undergo follow-up operations on injuries suffered last season.
Richard Collinge, head of the club’s medical department, told whufc.com: “Andy played and scored in Sunday’s match (against FC Winterthur) but is still reporting some discomfort in his ankle and further scans have revealed that he requires some minor surgery to provide more strength and stability to the area.
“Winston has been suffering some swelling around the knee injury that he sustained at Swansea last season and he too is in need of explorative surgery to clean up the area.
“We have decided that this is the best course of action to ensure that both players have a chance of returning to full fitness as soon as possible.”
Hammers manager Manuel Pellegrini added: “We are obviously very sad to hear that Andy and Winston have suffered setbacks. This is a big blow for them and us but we hope to see them back in action as soon as possible.
“It does mean that we have lost two senior players in key areas, though, and we’ll continue to work hard with the owners to make further additions to strengthen the playing squad, beyond the five new signings already confirmed.”
Unai Emery has suggested Arsenal‘s transfer dealings for the summer are complete as he prepares for his first season in charge at the Emirates Stadium.
The Gunners have been busy in recruiting the players identified by Emery, as well as head of football relations Raul Sanllehi and head of recruitment Sven Mislintat.
France Under-20 international Matteo Guendouzi is the latest acquisition following moves for Stephan Lichtsteiner, Bernd Leno, Sokratis Papastathopoulos and Lucas Torreira.
While the club continue to be linked with a new winger, Emery believes Arsenal’s transfer business may already be concluded
“Normally, in my career the big clubs don’t close the (door) or the moment to sign a new player,” he said.
“Today, we are okay. Maybe we can bring in one if there’s a very good possibility for them to help us, but the club has done a great job of signing new players and I am happy.
“We signed the players who we needed and only if one player is a big opportunity for us will we sign them. We will only sign a player in the next month if he’s a big opportunity.”
Emery also revealed he intends on naming a quintet of captains, with current skipper Laurent Koscielny set to keep the armband even though he is set to miss the start of the season with an Achilles injury.
Who will lead the Gunners on the pitch is just one of many questions Emery faced as he met the media at the club’s training ground on Thursday afternoon.
Emery, 46, was appointed as head coach following Arsene Wenger’s departure at the end of last season and – while he admits he needs to get to know his players better – he wants to have a host of players ready to step in as captain.
“We’ve spoken about that,” he said.
“My idea is to know every player and to know, also, the personality of the players. And then, I think my first idea is to have five captains in the team. But at the moment, I don’t know the names.
“I need to know more and also, firstly, Koscielny is the first captain now and for me, I have respect for that. Then, we are looking at, looking for, who are the players whose personality is the best in the dressing room.
“We want to keep the respect for these players and to find the captain and choose very well the best player for that.
“The first two weeks for us is to start knowing the club, knowing the players, knowing all the people who are working with us.”
Emery won the domestic treble at Paris Saint-Germain last season and believes he does not feel he needs to pick the brains of Wenger to find out more about his squad.
“Each coach needs to know the players,” he added.
“Not all the coaches have the same relationship with a player and I have my personality. I want to know with my direct opinion, with my direct conversations with the player.
“I have information on the players for the club, from the people around me. The information with Arsene is also important for me but the best is my direct relationship and conversations with the players.”
The club are yet to make an official announcement, and it is thought they are waiting until they can confirm Maurizio Sarri as Conte’s replacement, along with the signing of Napoli midfielder Jorginho.
Conte won the 2016-17 Premier League title in his first season with Chelsea after installing his revolutionary 3-5-2 formation.
However, things began to unravel last season as a poor transfer window saw the relationship between club and manager strained, and their title defence never quite got going.
Though he won the FA Cup in May, his fate seemed to have been sealed long before then as his exacting style began to frustrate both his players and the club hierarchy.
However, his departure has been delayed by Chelsea’s struggles to name a replacement, as Napoli have played hardball over Sarri, demanding that the Blues pay the £7million buyout that is part of the Italian’s contract with the Serie A club.
Conte was still in place as Chelsea’s pre-season began this week, and he took charge of the initial training sessions.
Cesc Fabregas ‘liked’ a message welcoming Conte’s departure on Twitter, later apologising and suggesting he had pressed the button in error.
He then wrote on Twitter: “Thank you Mister for another Premier League title and FA Cup. It wasn’t easy for me to convince you in the beginning but in the end I hope I did you proud! Good luck for the future.”