After a disappointing season, this summer’s transfer window is going to be very important for Chelsea to get right.They have already made one very encouraging decision by appointing Xabi Alonso as manager. However, a lot of work needs to be done on the squad to ensure it is not only stronger but also the right size.That means a busy few months are in store — some might say no change there. This is the first of many Chelsea editions of The Transfer DealSheet that The Athletic will be providing throughout the summer.The information found within this article has been gathered according to The Athletic’s sourcing guidelines. Sources with knowledge of transfer dealings, who asked to be kept anonymous to protect relationships, have been spoken to before offering the clubs involved the opportunity to comment.Who will make key decisions this window?The process will remain a collaborative one between the sporting leadership team, ownership and Alonso. By giving him the job title of manager rather than head coach like his predecessors, Alonso is going to be more involved.That is not to say he has been given the keys to make all the decisions, either, nor that previous head coaches had no say in recruitment.What positions will they be looking at in the summer window?Chelsea intend to buy a minimum of two ready-made players who are able to go straight into the first XI.The signings in question will have the experience of playing in one of the top five European leagues and know what it takes to handle an intense fixture schedule.With Chelsea not playing in European competition in 2026-27, they do not want to make too many additions. That is why they are looking to add just one centre back as things stand. Chelsea also want a flexible attacker who can play in multiple positions.Signings in other areas may depend on who goes.Chelsea will not play in Europe next season (George Wood/Getty Images)What is the manager’s priority?The same areas as highlighted above.Alonso has already told the club he wants to build a group of ‘mentality monsters’, and that will be reflected in the signings Chelsea make.Alonso does not officially start work until July 1, and some choices, both in and out, will clearly have to wait while he has time to work with and assess the current squad.Are there any specific players they are targeting?Chelsea have at least 10 names on their wishlist.One of them is Morgan Rogers, who they have had interest in since he was playing for Middlesbrough. They are among the three to four teams looking to buy him from Aston Villa. He clearly fits the requirement for a player who can operate in a number of attacking positions.