Have to agree on Vieira. It's a shame because pre-World cup he was looking quite good.
Came in vs Brentford for Odegaard and also vs Wolves for Xhaka, both away games and the team didn't miss a beat and he played well.
Then post-World cup things seemed to stop coming off for him and maybe he lost confidence/rhythm and struggled every time he was swapped in for home games against "easier" opposition.
Now it's hard to see him contributing positively to the team and a loan is definitely required.