Mikel Arteta admitted Arsenal have to get their "energy" back for the Champions League showdown with Paris Saint-Germain after a lacklustre 2-2 draw against Crystal Palace left Liverpool on the brink of winning the Premier League.
Arteta's side were hoping to warm up for their first Champions League semi-final appearance since 2009 with a victory over Palace at the Emirates Stadium on Wednesday.
But Jakub Kiwior's third-minute header for the Gunners was cancelled out by Eberechi Eze's volley in the 27th minute.
Leandro Trossard's strike put Arsenal back in front three minutes before half-time, only for Palace substitute Jean-Philippe Mateta to loft a brilliant lob over out of position keeper David Raya in the 83rd minute.