Pablo Fornals' transfer to Real Betis has finally gone through, with the Spanish club paying £6.8million for the midfielder's services.
The Hammers are however still scrambling to fix the fiasco of Said Benrahma's failed move to Lyon.
FIFA had been investigating why West Ham failed to sell Benrahma and Fornals on deadline day after Lyon and Real Betis accused the English club of botching the paperwork.
The Spanish midfielder sent out a message to West Ham fans via the club's official X page, which read: 'Hello everyone. So, West Ham fans, I am here one more time at London Stadium and hopefully not the last one.
'I just want to thank you for these four seasons and a half and for the good memories.
'I arrived as a kid and became a man here and it was such a great pleasure for me to fight from relegation in my first season to become sixth in the league, to play a semi-final of European football with you the next season and to win a trophy.
'I have such big memories. You’re always going to be in my heart. This stadium, this team and this crowd will be with me always.
'I think you are waiting for this… West Ham are massive, everywhere we go! Pablo x.'
It comes on the back of a debacle on deadline day, with Lyon all set to have Benrahma sign his contract live on television only for the £15million deal to dramatically break down.
That embarrassment led to the French club’s explosive statement in which they said West Ham showed ‘a deep lack of respect’ towards them and the player who had completed his medical in France during the day.
West Ham manager David Moyes responded to that accusation at his Friday morning press conference, saying: ‘It’s a big word to use before we get a chance to show exactly what happened or didn’t happen.’
On whether Benrahma would still be willing to play for him again, Moyes added: ‘I would expect so.’
Betis were less incendiary as they had suggested they still expect their £6.8m signing of Fornals to be ratified because it was a ‘computer problem’ on West Ham's part.
Both Lyon and Betis are now in contact with FIFA, football’s world governing body who are looking into the doomed deals which livened up an otherwise subdued deadline day.
Conspiracists were theorising on Friday that West Ham purposefully delayed the paperwork as it became painfully obvious during their 1-1 draw with Bournemouth that they lacked a left winger.
Yet club insiders strongly deny they would ever stoop to such behaviour with one source saying they simply ran out of time with the Benrahma deal.
Fornals arrived at the London Stadium with the team ahead of Thursday’s fixture and was due to be involved until it became clear that he was on the verge of signing for Betis.