Joel Campbell reportedly told Arsenal he wanted to leave in the transfer window and Benfica may have been on the brink of snapping him up.
Having spent last season on loan at Olympiacos, Campbell hoped that his heroics for Costa Rica at the World Cup would earn him the chance to command a first-team place in Arsene Wenger's side.
But despite a serious injury to Olivier Giroud, Wenger appears to see Campbell as a back-up and the striker indicated that he would like to move on.
Arsenal added Danny Welbeck from Manchester United on deadline day, which may have freed up Campbell to leave, but it seems Benfica fell agonisingly short of agreeing a fee.
Had both sides had no other business to attend to and more time to discuss things, a deal may well have been agreed but the frenzied atmosphere of deadline day proved the wrong conditions to find a compromise.
A loan move was also mooted but in the end there simply wasn't time to come to an arrangement and temporary switches can sometimes prove more complicated as agreements over who pays what percentage of the wage bill can be difficult.