I am sometimes a man of few words and so I shall prove with this short post. The options at right back with Bacary Sagna out for several months include Jenkinson, Koscielny, Coquelin and Santos.
My money is on Kos. He has played there in the past, thus he has some experience and he seems to have the right attributes for the right back slot. Young Jenkinson is not yet ready, this has been clear so far. Coquelin is happy in the midfield and should play there. Santos is as one sided as they come and the right is his side.
I would be very surprised if Koscielny does not become our regular right back for the next few months.