Bertrand might leave Southampton to join arsenal. I think this is an obvious choice where he should go if Southampton is still interested to sign him on loan. KWP is developing pretty good as a right back under Ralph, and I think moving to Southampton will benefit him to develop as good full back.
I used to think he can be like Phil Neville playing both left or right back but I just realised his game seems to be a natural left back. Defensively, I don’t see the difference between him playing as left or right back but on possession, he’s much more sloppy as a right back.
Loan him for 2 years, come back and be a left back if you are good enough. Telles would be in his 30is in 2 years anyway which perfect time to take his spot.