The defender completed a move from Valencia on Tuesday.
The striker is facing an uncertain future under Jurgen Klopp at Anfield.
The defender officially joined the Gunner from Valencia on Tuesday.
Tottenham are in profit from their transfers this summer.
HITC Sport understands deal agreed despite recent injury.
Chelsea are reportedly keen to bring David Luiz back to Stamford Bridge for a fee of around £30 million.
The Baggies are considering going after the Hornets forward in the final hours of the window.
HITC Sport understands transfer is agreed and player is due for medical.
The Championship side are reportedly willing to let the midfielder move on during this window.
Mauricio Pochettino has reportedly spoken to Real Madrid playmaker Isco.
Two cup finals, but now Liverpool are performing on a European stage, with more people watching them than for a while; further evidence that his appointment was the right one.
The young midfielder shone in Liverpool's 2-0 win over Watford at Anfield.
Stars from Bournemouth, West Ham United, Manchester City and Sunderland all feature.