Nikola Vlasic has suggested to Croatian outlet 24 Sata that part of the reason that he picked the shirt number he did when he made the move to Everton in the summer was because the Toffees were keeping the number 19 jersey free for Diego Costa.
The Daily Mirror reports that Everton were keen on signing Costa during the summer transfer window and his days at Chelsea certainly appeared to be numbered despite helping the Blues to the Premier League title last season.
However, nothing seemed to come of the reports linking Costa with a move to Goodison Park, and The Telegraph reported back in September that he had agreed a £57 million move to former club Atletico Madrid, which will come into effect in January.
But it appears that Everton were optimistic about their chances of bringing Costa in, as Vlasic suggested that when he joined the club, Costa's preferred shirt number was being kept free for the Spain international.
Ronald Koeman is probably wondering right now what could have been had he been able to bring Costa in, as there is no question that not having a marquee striker is one of the main reasons for their poor start to the season that ultimately resulted in the Dutchman being sacked earlier this week.
And while Costa may not have fixed every issue, his form at Chelsea certainly suggests that he could have made a massive difference to the Toffees' side this term had they managed to get a deal across the line.