Crystal Palace’s Conference League hopes hang in the balance after a 1-1 draw against Bosnia and Herzegovina’s Zrinjski Mostar in the first leg of their knockout phase playoff.

Oliver Glasner had reinforced his attacking ranks since their last European outing in December, but it was Ismaïla Sarr, assisted by the January signing Jørgen Strand Larsen, who broke the deadlock on the stroke of half-time.

• Mercedes chief attacks backlash over engine loophole

• Vote on legality of power plant ‘a storm in a teacup’

Toto Wolff, the Mercedes principal, has snapped back at “utter bullshit” about a potential fuel problem a day after the FIA proposed a mid-season rule change over the team’s controversial engine.

It was announced on Wednesday that a vote will take place over whether a regulation change should be implemented from August onwards over the legality of Mercedes’ engine, after they were adjudged to have found a loophole that allowed them to deliver a higher limit when their engine is at operating temperature.