John Hartson has posed whether the Premiership is strong enough after Celtic's comfortable win over Hearts this afternoon.

Robbie Neilson's men went down with a whimper as the Hoops stormed to a 3-0 victory at Tynecastle.

Aaron Mooy got the visitors off to a flying start, scoring after two minutes. 

Kyogo then scored right before half-time, with Cameron Carter-Vickers then adding some gloss to the result around ten minutes from time.

Hearts were without some big players, such as Lawrence Shankland, Robert Snodgrass, and Craig Halkett.

However, their performance in this one didn't merit anything close to a semi-final place in the Scottish Cup.

The gulf between Celtic and every other team in the league is clear to see. 

But Hartson has questioned the quality of the top-flight sides outside of the top three given that Celtic were streets ahead of Scotland's third-best team.

READ MORE: Cameron Carter-Vickers given 'best defender in the league' Celtic tag

Hartson said on Viaplay Sports 1: “Hearts have a lot of injuries - missing their top scorer Lawrence Shankland and Robert Snodgrass who can make things happen, long-term injuries like Craig Halkett who is their leader - but saying all that they are still doing fantastically well.

“They are third in the league and maybe we need to look at the league. Is the league strong enough? Hearts are up to third and for me are the third-best team in Scotland but who else is really threatening Hearts right now?

"They are five points ahead of Hibs and way clear of other teams. Celtic, Rangers, and Hearts are the top three teams and the other teams have to do a lot more to catch up.

“Celtic march on. They are steamrolling everyone right now, they really are. They are 21 games unbeaten. They’re awesome. The one thing Hearts had to do - and I said it at the start of the game - was stay with Celtic.

“You can’t gift Celtic anything. In the first minute, Celtic got in behind and Reo Hatate had a really good shoot.

"Zander Clark made the save, and a minute later Celtic go a goal in front and all of a sudden Hearts have an awful lot to do.

"Hearts came back into the game with the Toby Sibbick chance but I can’t recall Joe Hart making another save in 90 minutes."