Merino missed the Gunners’ most recent match - against Crystal Palace last Wednesday - and was a doubt for the first leg of Arsenal’s semi-final against PSG at Emirates Stadium on Tuesday. The Spaniard, however, took part in training on Monday afternoon and is expected to be fit for the game.

Arsenal and Paris Saint-Germain are gearing up for a massive UEFA Champions League semifinal, with just 180 minutes separating them from a place in the final. The two sides met earlier in the group

The Gunners beat PSG 2-0 in the league phase of the Champions League way back at the start of October and it was fairly comfortable for them, although PSG did hit the woodwork twice and showed glimpses of the team they have become.