Hasn't got a lot of traction on here, but for me one of the most interesting comments yesterday was 'Sissoko would have completed the perfect picture'.
Seems that Koeman was after him to fill several different positions (CM, AM, WM) in the midfield.
Way I see it, Koeman sees the squad as:
Goalkeepers (3)
- Stekelenburg
- Joel
- Hewelt
Defenders (9)
- Coleman
- Browning
- Holgate
- Williams
- Jagielka
- Pennington
- Funes Mori
- Baines
- Oviedo
Midfielders (8)
- Gueye
- McCarthy
- Barry
- Gibson
- Cleverley
- Davies
- Dowell
- Barkley
Forwards (7)
- Lukaku
- Kone
- Valencia
- Mirallas
- Lennon
- Deulofeu
- Bolasie
You can see from that how the squad is 'set-up' for the 4-3-3 system. He obviously felt that - possibly given the form of Stek and Holgate - the main area we could improve on deadline day was midfield and up front.
Maybe Valencia wasn't the first choice, but at least we got another option in who is better than what we had.
Sissoko, similarly, would have added pace, power and versatility - which in Koeman's mind is clearly what our midfield lacks. So I can definitely see that being an area targeted come January.