Scott Brown and Paul Hartley epitomised the rambunctious nature of the Edinburgh derby when they lined up in the midfield of Hibs and Hearts respectively.

They had a couple of run-ins at Easter Road and Tynecastle Park, while each individual was the player the opposition crowd loved to hate.

It was hard to see at that point Brown speaking of his admiration for Hartley at any point.

Yet, the pair would go on to become team-mates at Celtic, helping the Parkhead side team win the 2008 league title and 2009 Scottish Cup final.

The Celtic captain amused fans when he tweeted praise of Hartley despite being a former Hearts star.

Brown, while watching a rerun of the match against Dundee United which clinched the 2007/2008 league title, posted: “Never thought I would of said this when I was at Hibs but what a man Paul Hartley is for a Jambo.”

It was a tweet which prompted Hearts fans to discuss the only penalty they have seen Hartley miss.

Scott Brown and Paul Hartley clashed while Hibs and Hearts players but would go on to become team-mates. Picture: SNS

During his time at Tynecastle, the current Cove Rangers manager took 17 penalties, scoring every single one, including spot kicks to clinch qualification to the Champions League qualifiers against and a hat-trick against Hibs in the 2006 Scottish Cup semi-final.

Hartley is one of only two Hearts players to have taken ten or more penalties for the club and have a 100 per cent record. The other being Willie Gibson, as per Hearts Heritage.

Yet, Hartley did miss a penalty at Tynecastle.

In a clash between Hearts and Celtic in November 2008, the visitors were awarded a penalty to make it 3-0. There was a firm expectation that the midfielder would find the back of the net, instead he failed to even hit the target.

Celtic captain's admiration for Paul Hartley despite his Hearts past - fans remember his only missed penalty