Reyna was sent off for two yellow cards, then issued with another red for violent conduct and received a further caution after the match for complaining to referee Willie Young, who also booked eight other players in a torrid evening at Hampden.
The fury was all sparked by Reyna’s challenge on Bobby Petta which earned him his second yellow. Neil Lennon went charging in to spark a near brawl in which Mols and Moravcik raised their hands to get their marching orders.
Given Rangers’ selection problems due to the massive Ibrox injury list, another two suspensions is the last thing Dick Advocaat needs as he tries to lift his troops.
There was also trouble at half-time when Tugay and Paul Lambert were booked for clashing in the tunnel and the Turkish midfielder did not appear again for the second half, although Advocaat later indicated this was for tactical reasons.
It was a penalty decision in 68 minutes which turned the game Celtic’s way and they will now meet Kilmarnock in the CIS Final, but this was a real black night for Advocaat in more ways than one
In the intensity of an Old Firm derby a good start is vital to settle the nerves and settle the flow of the game and for Rangers things could hardly have gone more wrong as they found themselves two down after 18 minutes.
Celtic came flying out of the traps from the opening whistle and hemmed the Ibrox men during all of the early moments. Their passing was sharper, their determination seemed greater and they had Rangers on the rack.
Perhaps not the night to be making your Old Firm derby but that was what Bob Malcolm had to contend with as the youngster was used as a centre back in a three-man defensive line beside Scott Wilson and Bert Konterman.
Only a minute had gone when Malcolm was judged to have fouled Henrik Larsson just outside the box. Nothing came of the resultant freekick but there was a much more serious outcome in a duel between these two players later.
Rangers could scarcely get out of their own half as they failed to handle Celtic’s whirlwind start and they almost inevitably lost a goal after six minutes.
Alan Thompson whipped over a freekick from the right and Ramon Vega powered a header which Stefan Klos brilliantly pushed onto the bar but Chris Sutton reacted quickest to hammer a right foot shot into the net.
It was just the start Dick Advocaat dreaded and Rangers still had not sorted themselves out when they went two behind after 18 minutes. Sadly, it was a personal disaster for young Malcom.
The rookie defender, making just his second start for the first team, slipped as the ball came into the box and allowed Larsson to lift the ball last him and then over Klos. It was just a nightmarish moment for Malcolm and Celtic could scarcely believe their luck.
Rangers looked like a team lost, but they rallied superbly, trying to play their way back into the game and gradually they began to gain some momentum. Barry Ferguson became the key man in midfield, but for all of their possession Rangers could not create any openings.
Happily for Malcolm he did not let the earlier slip affect him and he settled into a good game, but Rangers still needed something to happen to get back into the game.
The moment came in 36 minutes when the Ibrox men won a penalty. Celtic failed to clear Albertz’s corner and as Scott Wilson challenged for the ball he was knocked to the ground by Vega.
The award seemed a little soft, but Albertz was not complaining as he slammed home the spotkick to claim the seventh Old Firm goal of his career.
Rangers were rampant now and pegged Celtic back as they fought to draw level but they could not find a way through by the time the half-time whistle sounded.
Both sides made changes at half-time with Advocaat sending on Allan Johnston for Tugay and Celtic swapping Bobby Petta for McNamara, who had been booked for a foul on McCann.
Rangers started where they left off, continuing the run the midfield area but without getting in behind the Celtic defence to any great effect.
Michael Mols was brought on for McCann to try and bring more firepower up front but still Rangers could not find a way through.
There was a sense that the game would hinge on the next major incident and, sadly for Rangers, it went Celtic’s way.
There seemed little danger as Scott Wilson tussled with Larrson for the ball on the right edge of the box in 68 minutes but Wilson was judged to have pulled the Swedish striker to the ground and a penalty was given.
It seemed a harsh decision and Klos was booked by Willie Young for complaining, but Larsson stayed cool to slot the spotkick into the net and the game was effectively over.
Rangers fought to get back in it and Mols flashed a header wide in 73 minutes from Numan’s cross, but it proved too tall an order.
However, there was insult added to their injury in a ferocious final minute of the match when Reyna and Mols were both sent off along with Celtic sub Lubo Moravcik as the whole affair ended in mayhem.
Reyna, who had been booked for fouling Lambert just before half-time, was woefully late on Petta on the touchline and had to go for a second yellow. He was then issued with another red card for violent conduct against Petta.
However, before Young could take any further action Neil Lennon sparked a brawl situation in which Mols and Moravcik raised their hands and were red-carded.
It was Celtic’s night and a real grim evening for Rangers, who will have to call on all of their character and strength if they are to save their season at Parkhead.
CELTIC: Gould; Mjallby, Boyd, Vega; McNamara (Petta 45), Petrov, Lambert, Lennon, Thompson; Larsson (Moravcik 75) Sutton. Subs not used – Tebily, Johnson, Kharine.
Sent off: Moravcik (90).
Bookings: McNamara (34), Lambert (45)
RANGERS: Klos; Malcolm, Konterman, Wilson; Reyna, Ferguson, Tugay (Johnston 45), Albertz, Numan,; Flo, McCann (Mols 58). Subs not used – Ricksen, Miller, Brown.
Sent off: Reyna (90), Mols (90)
Bookings: Tugay (45) Konterman (46), Johnston (66), Klos (68), Albertz (80), Ferguson (81)
Ref: Willie Young.
Att: 50,000.
Man of the match: Barry Ferguson
Moment of the match: Sadly for Rangers it was the penalty incident which turned it for Celtic.