Five major talking points from Rangers v Celtic; including Deila's future, McKay's brilliance

Celtic V Rangers Reserves

Celtic lost on penalties to Rangers in the Scottish Cup on Sunday.

Too many Celtic players go missing

Celtic needed big performances from everybody against Rangers, yet it was teenager Kieran Tierney who shone the brightest. Players like Stefan Johansen, Gary Mackay-Steven and arguably even captain Scott Brown had little impact on the game when Ronny Deila needed them most. As the Bhoys enter a crucial summer transfer window, the futures of players who go missing on the big stage should be considered - and Johansen and Mackay-Steven come into that conversation.

It's time to go, Ronny

That bring us to manager Deila. The Norwegian has been under huge pressure throughout the season, but losing to Championship side Rangers may prove to be the stick that broke the camel's back. Deila may well win the Scottish Premiership title, but that surely isn't enough to keep him in the job, as performances have been poor, and they can't even suggest that they're much better than Rangers after Sunday's result. It's time for Deila to go, and be replaced by somebody who can take the club forward again.

McKay proves just how good he really is

The undoubted star of the show was Rangers winger Barrie McKay. The 21-year-old was an afterthought at the start of the season, but has become a key player under the tutelage of Mark Warburton. On top of great performances throughout the season, McKay then starred on the big stage, tormenting Celtic all afternoon before scoring a stunning long-range goal to put Rangers 2-1 up. McKay looks destined for a huge future under Warburton at Rangers, and a Scotland cap can't be far away.

Warburton on course for incredible treble

It's been a sensational first season at Ibrox for manager Warburton, who has put Rangers back on the straight and narrow in less than a year. Having won the Scottish Championship title as well as the Petrofac Training Cup earlier this month, Rangers already have two trophies to their name this season - but Warburton will be looking for a remarkable treble. The Scottish Cup final against Hibs is a huge chance for Rangers to cap off an almost perfect season, and winning the cup would hand them a place in the Europa League, which would be another huge step for Rangers and Warburton.

Four years wasted for Celtic?

Ultimately, this game will be seen as a huge failure for Celtic, not just on the day but over the last four years. Rangers' demise in 2012 left Celtic alone at the top of the Scottish football mountain, and should have been the catalyst for Celtic to kick on and make sure that, even when Rangers did make it back to the top flight, they wouldn't be any competition for the Bhoys. Instead, Celtic have been coasting over the years, selling big-name players and struggling in Europe. Their title wins have come almost by default due to the lack of competition, and before Rangers have even come back to the Premiership, they've already beaten their Old Firm rivals. Celtic's perceived stature above Rangers was diminished in one afternoon, but it was the lack of progress over the last four years which led to their defeat at Hampden Park.

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