Rangers fans wave flags during the Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)
A general view during the Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)
Celtic fans let off a flare during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)
The Celtic team huddle ahead of the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)
Nir Bitton of Celtic holds off pressure from Kenny Miller of Rangers during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)
Rangers’ Gedion Zelalem (L) and Celtic’s Scott Brown (R) in action during the Scottish Cup semi-final match between Glasgow Rangers and Celtic Glasgow at Hampden Park in Glasgow, Scotland, 17 April 2016. EPA/ROBERT PERRY
Kenny Miller of Rangers scores the opening goal of the game during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)
Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)
Erik Sviatchenko scores the first goal for Celtic. Action Images via Reuters / Russell Cheyne
Erik Sviatchenko celebrates after scoring the first goal for Celtic. Action Images via Reuters / Russell Cheyne
Rangers manager Mark Warburton talks to his players prior to extra time during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)
Barry McKay scores the second goal for Rangers as Celtic’s Craig Gordon attempts save. Action Images via Reuters / Russell Cheyne
Barry McKay celebrates with James Tavernier after scoring the second goal for Rangers. Action Images via Reuters / Russell Cheyne
Kieran Tierney celebrates after Tomas Rogic scored the second goal for Celtic. Action Images via Reuters / Russell Cheyne
Celtic’s Craig Gordon attempts to save the penalty from Rangers’ Barry McKay. Action Images via Reuters / Russell Cheyne
Celtic’s Scott Brown looks dejected after missing his penalty during the shootout. Action Images via Reuters / Russell Cheyne
Rangers players celebrate after winning the penalty shootout. Action Images via Reuters / Russell Cheyne
Dominic Ball and Rob Kiernan of Rangers celebrates after winning the penalty shoot out during the Scottish Cup semi-final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)
A emotional Rangers fan at the end of the match. Action Images via Reuters / Russell Cheyne
Rangers manager Mark Warburton (L) celebrates their win with James Tavernier at the end of the Scottish Cup semi-final match between Glasgow Rangers and Celtic Glasgow at Hampden Park in Glasgow, Scotland, 17 April 2016. EPA/ROBERT PERRY