The 22-year-old French forward, who joined United from Monaco for £36million in September 2015, scored 11 goals across 43 appearances in all competitions for the Premier League giants last season.
But his representative Philippe Lamboley claims that Martial and United have failed to reach an agreement on a new contract in recent months, saying “the time has come” for the player to move on.
Lamboley told RMC Sport: “After thinking about all the factors and possibilities, Anthony wants to leave Manchester United. There are lots of factors, and right now it’s too early to talk about them.
“Manchester United want Anthony to extend his deal and do not want him to leave but we have not reached an agreement for several months.
“I think that when Manchester United, the most powerful club in the world, do not find an agreement after eight months of negotiations then they do not really want to keep such an important player in their squad. That’s why this decision has come – it’s a well-thought-out decision.
“It’s important to remember that he is under contract and that Manchester United will have the last word. We will respect the club’s decision and he will stick with his commitment to the end.
“Anthony is disappointed because he has shown his love for the club and the supporters for three seasons. Without the unconditional support of the fans he would have already asked to leave United.
“But he got hooked and showed great professionalism and was successful. I think he has done his best for three years and it is important to remember that he scored 11 goals and made 10 assists in five months of last season.
“Everyone will have their opinion but I think he needs to resume his career. The time has come.”
Martial has 11 France caps but is not part of the squad which will compete at the World Cup in Russia.
The former Napoli chief was high on Chelsea’s list of managerial targets, but talks broke down over a £7 million release clause in the Italian’s contract with the Serie A club. Napoli owner Aurelio De Laurentiis is insisting that clause be paid, even though it expired on May 31 – not to mention, Napoli have hired Carlo Ancelotti as a replacement.
Chelsea have reportedly sounded out former Paris Saint-Germain boss Laurent Blanc and current Fulham manager Slavisa Jokanovic, with Blanc having spoken to potential assistants in case he gets offered the role. Ex-Barcelona manager Luis Enrique and Roma‘s Eusebio Di Francesco have spoken to the club about the vacancy, but have reportedly been ruled out.
Instead, the Blues continue their pursuit of Sarri, even as it holds up their transfer business. The club has final say on transfers regardless of who the manager is, but Sarri has reportedly singled out a few targets – Napoli defenders Kalidou Koulibaly and Elseid Hysaj.
Eden Hazard, meanwhile, has said Chelsea’s decision on a manager will affect his future at the club, with the Belgium star wanting to play under a more attacking manager after two seasons under Antonio Conte.
The former Arsenal midfielder played more than 200 matches for the Gunners and won the Premier League twice in a nine-year spell at the club from 1998.
Following a short stint as assistant manager at Wolfsburg, the former Sweden international will formally return to Arsenal next month.
“I’m delighted to be returning to the club,” Ljungberg, 41, said. “Arsenal has always been a special place for me and I’m really excited at this opportunity to work with our under-23 team.
“I look forward to working with the talented young players we have at the club.
“I know many of them well and will work hard to help them continue developing and become the best players and people they can be.”
Ljungberg joyed Arsenal from Halmstad in 1998, and played a prominent role in the north London side’s Premier League and FA Cup double triumph of 2002. He was also part of the Invincibles team which went unbeaten for the 2004 league campaign.
The midfielder left Arsenal in 2007 before brief spells at West Ham, Seattle Sounders, Chicago Fire and Celtic. He hung up his boots in 2012.
Ljungberg, who also played 75 times for Sweden, previously coached the Arsenal Under-15 and Under-19 squads.
He moved to Wolfsburg as former Arsenal Academy manager Andries Jonker’s number two, but left when Jonker was sacked by the German side after just seven months in charge.
Arsenal’s new Academy manager Per Mertesacker said: “It’s great to have Freddie back at the club. He brings great footballing experience and the highest possible levels of enthusiasm, energy and encouragement for our young professionals.
“He understands the club’s values and how important it is to give young players the opportunity to grow and develop.
“When Freddie left for Wolfsburg it was with the club’s blessing and with a return to Arsenal some day in mind.
“Everyone knows Freddie loves the club and we look forward to him developing his career with us.”