Karl Lacey

Much of Lacey's inter-county success came in his middle and later years. He was first called up to the senior team by Brian McEniff for winter training in 2003.

A substitute appearance against Antrim brought him his debut in 2004 under the management of McEniff.

Lacey played in the 2006 Ulster Senior Football Championship Final at Croke Park.

Lacey has lined out for Ireland against Australia in the International Rules Series. He did so in 2006 and in 2011.

Lacey was part of the Donegal team that won its first National League title in 2007 in the final against Mayo.

The 2011 season began Donegal's renaissance under Jim McGuinness, an era for Lacey which coincided with his late career. Not only did he receive an All Star award and Ulster Championship medal in 2011, but Lacey also put in a number of great displays and usually kept each opponents danger man quiet while collecting a few scores himself. In the semi-final of the Ulster Championship, Lacey was deployed on Tyrone's in-form player, Brian McGuigan. Lacey excelled and kept McGuigan from having any real say in the game. Not only did he display his defensive qualities but he also showed his attacking side when he provided an assist for Colm McFadden's goal through a surging run from deep. He also set up the winning goal coming from Dermot Molloy which left the final score at 2–06 to 0–09. In the final they faced a strong Derry side, on-form after a huge win over Armagh. This time Lacey was deployed on another danger man, Mark Lynch. Donegal lifted their first Ulster Championship title in a number of years. Lacery received an All Star award and the Ulster Footballer of The Year Award.

On 5 August 2012, Lacey surged up the pitch and scored the point that sealed Donegal's comprehensive victory over Kerry in the All-Ireland Senior Football Championship quarter-final at Croke Park.

On 23 September 2012, he delivered a high ball towards team captain Michael Murphy who smashed the ball into the Mayo net after three minutes of the 2012 All-Ireland Senior Football Championship Final. He was also in possession at the final whistle and sent the ball clattering into the crowd with glee.

With his club Four Masters, Lacey won the 2003 Donegal Senior Football Championship. He scored two second-half points in the final against Termon. To date, he has collected one SFC, one U21FC and two MFC medals with his club. He went off injured at half-time in the 2012 Donegal Senior Football Championship semi-final against Naomh Conaill—and Four Masters lost. In 2015 relegated to division 2 of the Donegal league in a play off lost to the mighty Realt Na Mara. Lacey captained Donegal to the 2002 All-Ireland Vocational Schools Football Championship, overcoming Kerry in the final. He won a Railway Cup medal with Ulster. At college level, he won three Sigerson Cup medals, one with UUJ and two with Sligo IT.

Following a league game on 3 March 2013, footballer of the year Lacey was hit by some spit from the mouth of a Tyrone fan. Lacey was targeted as he left the pitch via the tunnel at Healy Park in Omagh. He had not been playing in the game due to a hip injury.

Following "spitgate" (see above), Lacey returned to training for Donegal on 30 April 2013 after attending a wedding in Malta. He declared his fitness ahead of Donegal's opening Ulster Championship clash with Tyrone, though he did not start the game; instead Jim McGuinness sprung him from the bench in the latter stages of Donegal's victory. Lacey then had keyhole knee surgery ahead of the Ulster semi-final against Down. He missed the match, ending a run of 41 consecutive championship appearances stretching back to 2004.

2014 brought Lacey a third Ulster title in four seasons. In the All-Ireland quarter-final against Armagh at Croke Park, Lacey was subjected to a vicious attack. During the same exchange the Donegal team doctor, Kevin Moran, was sent flying through the air, spiking a major reaction from national and social media.

Before retiring from inter-county football Lacey was a strength and conditioning coach with the county under-age development squads. When Declan Bonner was reappointed manager of the Donegal senior team in 2017, and having recently retired from playing inter-county football, Lacey was included as part of Bonner's backroom team. Lacey departed after one year for family reasons and Stephen Rochford was appointed in his place.

Lacey married Ciara McGroarty in the village of Cacela Velha on the Algarve in September 2017, shortly after announcing his retirement from inter-county football. The reception was held at the Praia Verde Boutique Hotel. The couple have a son, Noah, born in 2015.