#2 Philippe Coutinho/Ousmane Dembele

When both Coutinho and Dembele arrived at Barcelona, they came in as the club's record signings, carrying weights of expectation on their shoulders to replace two of the greatest players in Barcelona's history.
In the case of Dembele, he was signed as a prodigiously talented 20-year-old after starring for Dortmund for one season and was brought in ostensibly as a replacement for Neymar. However, a string of serious injuries and unprofessional conduct have hampered his Barcelona career.
Philippe Coutinho has undoubtedly fared worse, as despite starring in his first half-season with the club, many expected that the long-term replacement for Andres Iniesta had finally arrived, but it horribly went off course for the Brazilian, as he struggled for form and was the target of boos from the Nou Camp crowd on multiple occasions.
The result of this is that neither player is certain of their Barcelona future heading into next season and their precarious positions are bound to get worse following Griezmann's arrival.
In light of the heavy finances expended on getting Griezmann, Barcelona might have to sell off some players to recoup some funds especially with respect to their interest in Neymar and one of Coutinho or Dembele are certain to leave the club to balance the books.
Also, from a sporting angle, one or both men might have to make way, as Griezmann's playing position on the field means that there would not be space for all three men in the same team.
Coutinho and Dembele have not really settled into their rhythm since arriving Barcelona and Griezmann's signing could well be an end to their disappointing spells in Catalunya.