The last four teams standing return to play in the UEFA Champions League this week for the first leg of the semifinals, when some of Europe's top sides will begin to map out their route to the final on May 31 at Munich's Allianz Arena.

A place in the Champions League final is on the line as Arsenal and Paris Saint-Germain battle over two legs. Fresh from two famous European nights against Real Madrid, Mikel Arteta’s side will be full of confidence as they begin the last-four encounter.

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.