Europe's best clubs may have fortunes to spend on new players during every transfer window - but that doesn't mean they always get it right.
Millions of euros are wasted across Europe on players who, for multiple reasons, don't work out.
The most recent summer transfer window has been no different - and although it's still early days, the five players on the list have impressed so far and look set to enjoy successful spells at their respective careers.
Serie A: Gervinho | AS Roma
Anyone who has followed the Premier League closely over the past two seasons - and particularly any Arsenal supporters - will be shocked at the transformation of Gervinho, who has been outstanding in his short spell at Serie A leaders AS Roma.
The Ivory Coast international was extremely disappointing in the Premier League but is currently shining bright in Serie A, with three league goals to his name already this term.
Bundesliga: Henrikh Mkhitaryan | Borussia Dortmund
Liverpool came close to signing Armenia international Henrikh Mkhitaryan during the summer transfer window, but it was Borussia Dortmund who spent £24.4m to secure his services in July.
Brendan Rodgers will now be looking on with deep regret as Mkhitaryan has settled in straight away at Signal Iduna Park, scoring three goals in his first six Bundesliga appearances for last season's Champions League finalists.
Mkhitaryan is the reason Dortmund fans aren't crying about the summer departure of Mario Gotze.
La Liga: Neymar | Barcelona
Costing a massive £48.6m, Neymar had to hit the ground running - and the Brazilian sensational has done exactly that in his first couple of months at the Nou Camp.
The 21-year-old has scored three goals and provided six assists in his first 11 matches for the reigning La Liga champions, and is currently deputising for the injured Lionel Messi, who Neymar has been nothing but complimentary about since arriving from Santos.
Barcelona, with Neymar, have won all eight of their La Liga matches so far this term.
Premier League: Mesut Ozil | Arsenal
Mesut Ozil has given Arsenal such a lift since completing his shock £42.4m move from Real Madrid at the end of the summer transfer window.
European football's assist king is a world-class player - and many at Real Madrid are still baffled why he was allowed to leave the Bernabeu.
Ozil's signing is arguably the best in the history of the Premier League given his pedigree and reputation, and it will be a surprise if the Gunners fail to end their trophy drought within the next two seasons.
Ligue 1: Radamel Falcao | AS Monaco
Radamel Falcao cemented his status as one of the best No. 9's in world football during his hugely successful spell at Atletico Madrid.
And he has continued from where he left off after completing his £53m summer move to AS Monaco.
The newly-promoted - but immensely rich - club currently top the Ligue 1 table after securing six wins from their opening nine matches, while Falcao leads the league's top scorer charts after scoring seven goals.
How long can Monaco realistically keep him for?