West Ham are about to complete their eighth signing of a dizzyingly good summer transfer window but another three could follow. Aaron Wan-Bissaka will be announced as West Ham’s latest capture on Tuesday. But the Hammers are not done yet in this stunning window, now being regarded as the club’s best ever. On paper at least. After some last ditch delays, Wan-Bissaka is said to have completed his medical and signed a long-term deal as West Ham’s new first choice right-back. At the outset of the window, it was made clear West Ham wanted at least eight signings this summer. It was needed too. Davi…