Mahrez will fight with Ozil, Ramsey, etc. Its not easy for him and i think the best for him is stay at leicester
He doesnt need to, he will be on the starting team no matter what. We could already guess arsenal's next season starting line up based on, if giroud hasnt been sold yet then he would be starter along with sanchez and mahrez as winger and ramsey and ozil as their midfielder , coaquelin as defensive midfielder