There are few things more frustrating in football than seeing a player that is owned by your club making headlines for his scintillating performances elsewhere, particularly when injuries are starting to pile up at home, and it's obvious to everyone - except the manager, apparently - that his team could use an injection of something different, that undoubtedly the missing star would've provided.
So, why do Premier League clubs time and time again make the same mistake of letting players leave on loan, when they could in fact be the difference between success and failure for your own season?
That's not to say that the loan market is a complete failure, for young, up-and-coming players it often provides a platform for them to gain experience of playing regular first-team football. But, there are far too many instances of individuals that are wrongly overlooked by their parent club, and forced to take in a temporary spell away from where they'd hoped to make a breakthrough.
Chelsea have been the serial abusers of the loan market in 2013/14, with no fewer than 27 players currently enjoying stints away from Stamford Bridge. On the whole, Jose Mourinho has been right to send a large number of exciting prospects out to continue their development.
But, even the "Special One" can make mistakes on occasion, and given the lack of striker options available to the Blues boss, there's one name in particular that stands out, that arguably shouldn't have been allowed to leave on-loan before the transfer window closed back in August.
Click through the tabs - above or below - to find out which on loan Chelsea star GiveMeSport says should've stayed at Stamford Bridge this season, as well as four other potential Premier League stars that shouldn't have been allowed to leave!