I'd go for Michael Dawson, natural English cb and leader. Not sure why we didn't move for him when he left the Spuds for Hell Shitty Tiggers. Not s world class but ticks boxes. Would free Kouyate up too to his better position of all round cm, which will free up Noble (as he appears to be undroppable by any manager) to run around aimlessly a bit further in less crucial defensive duties. Really we need a Grinder in midfield too.
RB, I like Byram, he looks a very natural full back and that needs working on. Jenks would be good, no more, as he ticks boxes; an improvement on current, English, and Prem experienced.
I wouldn't bother with a striker unless one come up who was a vast improvement. We're not getting the balls and play up, or into the strikers. That's the area of conern, feeding them. Send Zaza back if able to lighten the load and give Fletcher more chances.
And I'm not bothered if Payet goes. Luxury players are great when all is well. Cash in our chips. Or not, not bothered.