The French international is clearly not happy with his current situation.
This week Sam Allardyce even claimed the deal for the 29-year-old was close to being done. The BBC Sport website quoted the West Ham boss as saying: "He would be another flair player that needs a stage to say 'look at me, here I am, I am still capable of producing the level of football I have produced in the past, at Chelsea and Real Madrid'.
"I think he is hungry to play football again. I think he has a bit to prove to himself as he has been nine months in the wilderness. It's an awful long time and I think he's realised just how quickly you can be forgotten in this game."
Diarra has not played in England since leaving Portsmouth for Real in 2009. From there he went on to have a career in Eastern Europe, first with Anzhi Makhachkala and then with Lokomotiv Moscow - whom he left in August.
The free agent, who has won 28 caps for France, looked set to be on his way to Upton Park but the deal soon fell apart.
It comes because of a conflict between FIFA, Diarra and his former club Lokomotiv - who sacked him in the summer.
Now the Frenchman has spoken of the failed move and FIFA in an interview with L'Equipe. He revealed that deals to join both West Ham and Inter Milan have been stopped by the governing body and that he cannot understand FIFA's stance:
"There is a conflict with Lokomotiv Moscow. And as long as it is not sorted, FIFA refuses that I can play.
"I got fired and I can not play football. I do not understand Fifa. It's a crazy thing because I'm free. Why Fifa taking so long? You really ask yourself questions...
"I am preparing to not play this season. Maybe I will not play at all! It will be very difficult for me to bounce back."
He then explained what happened at the Russian club, suggesting he refused to sign a new contract at the club so he therefore got the sack yet, for some reason, he remains ineligible in the eyes of FIFA:
"The management wanted to change the contract. I refused and I got fired.
"[It's like] I'm in a movie. The urgency is that I can play football again, quickly."
West Ham now looks like an unlikely venture for Diarra, at least not for now. But hopefully this problem can be resolved soon because for this player, not being allowed to play the game he loves or work for payment, is starting to become an ugly mess.