Marcus Rashford's future, moving on from Casemiro and the 10 issues Erik ten Hag and INEOS must resolve this summer as Man Utd boss extends his contract

Now that Ten Hag's future has been rubber-stamped, he will need to finalise his coaching staff for the new season. Forwards coach Benni McCarthy has left the club and Ten Hag is hoping to add legendary United striker Ruud van Nistelrooy to his staff along with Dutch coach Rene Hake, who he first worked with 19 years ago at FC Twente.

Put simply, United's defence last season was a calamity. The team conceded 58 league goals, 15 more than the previous campaign. They also surrendered an average of 17.6 shots per game, higher than every side apart from Sheffield United.

Part of the problem was that injury issues meant Ten Hag had to field 15 separate centre-back partnerships. He also had no fit left-backs, as Tyrell Malacia missed the whole campaign and Luke Shaw played just 12 league games. So United must prioritise bolstering their back line, with the aim of getting at least three new defenders.

Jarrad Branthwaite is a good option at centre-back to replace the departing Raphael Varane, while Bournemouth's Milos Kerkez would be a shrewd left-back signing.

Throughout last season, many fans were left wondering exactly what Ten Hag's plan was. The manager earned his reputation on the back of Ajax's thrilling positional play, but in his second campaign in Manchester, United became a counter-attacking side that was not too dissimilar from Ole Gunnar Solskjaer's team, but without the defensive solidity.

Ten Hag's tactical flexibility did mean United ended up winning the FA Cup and shocking City, but that blueprint is not sustainable throughout the season. So Ten Hag and newly-appointed technical director Jason Wilcox must redefine how the team should play and design a squad that best suits that particular style.

The last few months have been terrible for United's image, painting the picture of an indecisive board who were willing to speak to every manager around while leaving their incumbent boss, as well as their fans, in the dark. Ten Hag was put in the highly uncomfortable position of being repeatedly asked about his future by journalists in every press conference, but there was no word from Sir Jim Ratcliffe, Sir David Brailsford or anyone else in authority.

United should put more members of the board up to speak to the media and address fans on non-football matters, thus allowing Ten Hag to focus on the team, as is the case at many European clubs. INEOS should also have more up-front communication with the boss now that they have given him their vote-of-confidence.

Ten Hag used United's injury crisis as his principal excuse for the team's dreadful results last term and seems to have successfully convinced INEOS that things will be different as long as his players stay fit. But the club cannot allow a repeat and must get to the bottom of the problem.

United have conducted a review of the problem with new doctor Gary O'Driscoll, who they hired from Arsenal, but Ten Hag's reluctance to rotate his squad and give players adequate rest must also be taken into account and challenged.

Players will face an extra strain next season due to the European Championship and the Copa America tournaments taking place over the summer, so the club must learn to manage their work load better.

Ten Hag has earned the reputation as a ruthless disciplinarian after his treatment of Cristiano Ronaldo and Jadon Sancho, but his authority was tested by Marcus Rashford missing training after his wild night out in Belfast and, on a far smaller scale, Alejandro Garnacho liking social media posts criticising the Dutchman.

Now that the manager is sticking around, INEOS must encourage him to continue the process and bring the "no good culture" he inherited when he first took charge of the club to an end.

Anthony Martial has finally left United, but the truth is it felt like he had left long ago. His long absences and scant contribution on the rare occasion he was fit meant that the club effectively had just one striker last season, and Rasmus Hojlund was still learning his trade.

The Dane had a decent first season but badly needed more support, and the club need to sign another striker who can share the burden with him and avoid a repeat of having to play Bruno Fernandes as a false nine when Hojlund is unavailable.

As Jamie Carragher never tired of reminding us, Casemiro's days as an elite footballer are gone. The Brazilian's struggles throughout the season came to a head at Crystal Palace late in the campaign, and he was dropped from the line-up for the FA Cup final.

That seemed to be the end point for him and he is the exact type of player - over the age of 30 and on a long and expensive contract - that INEOS want to move on from. United will have to take a big loss on him, but it will be worth it as, on a sporting level, they cannot afford to carry a player who is on such a steep decline.

INEOS' decision to stick with Ten Hag has effectively sealed Sancho's fate, although it was felt that the winger had already burned his bridges with the club after refusing to apologise to the manager for calling him out on social media.

Now they have put their faith in the Dutchman, they must find a quick solution to the Sancho saga, and selling him for a fee of around £25m ($31m) should be achievable after his superb performances in Borussia Dortmund's run to the Champions League final.

The club also need to sell Mason Greenwood, who has rekindled his career on loan at Getafe but could still severely damage United's reputation if he were to return to Old Trafford. Fortunately, there do seem to be plenty of interested parties across Europe.

Ten Hag seemed to have forgotten that he was still Rashford's manager when he bluntly declared on Dutch television that the forward did not deserve to be included in the England squad. Rashford had a miserable campaign on and off the pitch, and there is a feeling among many United fans that the best thing for everyone would be for him to leave. The forward would, after all, garner a hefty transfer fee, which could then be reinvested in the squad.

But whether they decide to sell or keep Rashford, the club need to make a quick decision on him and make it public so that they can begin building the squad with clarity.