I'll be there on Tuesday too. Travelling by train from Kyiv. The stadium is a bit isolated, situated on a large square where there are two metro stations. There are several bars and restaurants in Plekhanivska st, and near to the metro entrances. When I was there last year however, we couldn't find anything suitable before the match started, and most bars had already closed by the time the match finished: at midnight local time. You might be better just doing what the locals do: buying bottled (spirits) drinks beforehand and adding it to the tea and coffee sold inside. There will be enough street traders near the main entrances.