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 PSG clash on Tuesday in the first leg of the Champions League semi-final. Opta's supercomputer and experts have predicted the mouth-watering tie.

Arsenal manager Mikel Arteta is urging his players to believe they can win the Champions League for the first time because they have already beaten “the best opposition you can face in the competition.