I am hot and cold on Foyth making as a CB in England, I like a lot but it all depends on how he settles down and that will come with experience. I am not making direct comparisons but look at De Ligt at Juve its difficult. (*I don't watch a lot of Juve but he has a fair few Penalties and OGs and the games I have seen make him look shaky)I wouldn't be surprised if we bought a new RB either in January or next summer. I don't think Foyth is a long term solution. I'm also not sure he's going to be a long term CB in England unless we're playing 3 at the back.
I think we need a new RB in January but I am not convinced we will get one.