If the Premier League wasn't quite sure what to make of Crystal Palace's surprise victory over Chelsea, then Sam Allardyce summed it up perfectly in his post-match press conference.“That shocked you all, didn't it...” he grinned at reporters.Cesc Fabregas' goal in the fifth minute suggested the game was going to go exactly as we'd all expected, but that was before Wilfried Zaha and Christian Benteke steered the Eagles into the lead.The question then, was whether they could hold onto it for the remaining 79 minutes, as well as a ridiculous amount of injury time.Palace's defence doesn't exactly have a reputation for being impenetrable, and with some of the chances Eden Hazard and Diego Costa were creating, it looked like only a matter of time before Chelsea equalised.However, there's been one big change at Selhurst Park since January.Since the arrival of Mamadou Sakho on loan from Liverpool, Allardyce's men have won four of their last six Premier League games.It hasn't quite lifted them out of trouble, as they're still just four points clear of the drop zone.A crucial three points at Stamford Bridge will do their confidence the world of good, though, and they had every right to celebrate.And it was Sakho who summed up the mood in the dressing room by posting a Snapchat video with team-mate Zaha - the only problem being that it was actually just a bit scary.

It's great to see the Frenchman back on form after the manner of his demise at Liverpool.

After a failed drugs test last season - after which he was cleared of any wrongdoing - the centre-back fell out with Jurgen Klopp on a pre-season tour.

There was no way back for him at Anfield. The 27-year-old even found himself training with the reserves, but it's clear the move down south has resurrected his career.

Twitter was loving his latest performance, largely making that joke that never gets old about Sakho finding Costa in his pocket.

It's not often that Palace find themselves at the centre of a title race, but they could have inadvertently had a big impact on where the Premier League trophy ends up next month.

Chelsea are still seven points clear of Tottenham after the Lilywhites' 2-0 win over Burnley, but for the first time in a while, it looks like they have a competition on their hands again.