Football fans (yours truly included) love playing armchair manager, which is why off-pitch discussions almost invariably include a debate on which player(s) a club needs and why.
Modern football is a complex ecosystem where your club also has to contend with other clubs, player (and agent) demands, financial uncertainties, sponsorship revenue as well as their own attractiveness which will vary depending on well the team is doing on the pitch.
That’s why clubs draw up prioritised lists for each position they are looking to strengthen. Alexander Buttner (currently playing for New England Revolution in the MLS) comes to mind.