As exciting as new signings and transfer rumours can be, for certain people they can spell problems.
Those certain people are, of course, players who may have their futures threatened by new competition.
The current Leeds United squad has undoubtedly served the club well, but there is little space for sentimentality in football and the Whites must continue to grow and avoid stagnation.
The club have already made five new signings and reports suggest more could follow.
Every time a new player arrives, the balance of the squad changes and new plans are drawn up, often concerning placements in the pecking order.
For these four players, recent additions and rumoured targets could raise doubts over their future at Elland Road.
The 27-year-old found himself out of favour last season, firmly behind Raphinha and Jack Harrison in the pecking order.
At times, the considerably less experienced Ian Poveda was preferred to Costa as an option from the bench and his future at Elland Road appeared bleak when the transfer window opened.
The Angola international does not seem to be on the verge of an exit, but links wingers in the gossip columns will be of concern to Costa, as the arrival of another wide man would surely put his West Yorkshire future at risk.
We want your views, Leeds fans. You can become even more involved with our Leeds Live Whites coverage by signing up to unlock a host of features, such as discussing the comments and taking part in special Q&AS where you can speak directly to reporters about the latest at Elland Road.
Shackleton finds himself at a crossroads in his career and may eventually have to offer Leeds an ultimatum.
If the midfielder continues to be used sparingly in the Premier League, his development could easily plateau and Leeds’ determination to recruit a central midfielder does not make Shackleton’s future at the club look particularly promising.
One of the factors which helped lure Lewis Bate from Chelsea was a clear pathway to the first team and if he leapfrogs Shackleton, the 21-year-old may deem his place in the squad untenable.
Unlike Shackleton, Klich is a player regularly trusted by Marcelo Bielsa. However, rumoured interest in Chelsea midfielder Conor Gallagher could leave the Poland international looking over his shoulder.
Klich operates ahead of Kalvin Phillips, but deeper than the chosen playmaker, covering ground and driving Leeds on from central areas while also bringing flair players into the action at every opportunity.
Gallagher himself is an all-action midfielder who is known for his phenomenal work ethic.
The parallels between him and Klich are evident and if a loan deal for the Chelsea man was sanctioned, Klich could find himself in an intense battle for his place.
It would be wrong to suggest Caprile’s future in the game appears bleak as few goalkeepers burst on the scene as teenagers.
Do you want an exclusive pre-season Leeds United preview – both in your inbox and through your letterbox? Head over here to find out more and secure your copy.
However, Leeds appear close to securing the signature of Valerenga goalkeeper Kristoffer Klaesson, who is 20 and less than 10 months older than Caprile.
Klaesson has seemingly been identified as a suitable understudy to Illan Meslier, suggesting Caprile is not currently being readied to rise up the pecking order.
Caprile has been with Leeds since January 2020 and if he sees a new recruit who is close to him in age instantly placed ahead of him, he may doubt his future.