The Former Grimsby and Sheffield United defender has returned to Portman Road until the issues with the contract are sorted out, which is likely to be around Wednesday.
Speaking to the East Anglian Daily Times, Frenchman Santos confirmed: "The deal is a little bit dead at the moment. There are one or two things to be sorted out between QPR, Ipswich and my agent and that will take a couple of days. But I expect I will join QPR by the end of the week."