AC Milan scored a dramatic stoppage-time equaliser to secure a 1-1 draw with Manchester United from the first leg of their Europa League last-16 clash at Old Trafford.
United, missing Edinson Cavani and Marcus Rashford through injury, looked to have done enough for a slender victory after taking the lead through teenager Amad Diallo's header at the start of the second half.
However, AC Milan made the Premier League side pay for not scoring a second goal when Simon Kjaer headed in from a corner.
The Italians thought they had taken an early lead when Rafael Leao broke clear to fire past Dean Henderson – but the forward was ruled offside.
Milan had the ball in the net again in the 11th minute when Franck Kessie slotted in after a throw-in, but this time the goal was ruled out following a VAR review for handball in the build-up.
Diallo replaced Anthony Martial for the second half – and the 18-year-old made an instant impact as he flicked home a quick free-kick from Bruno Fernandes to head United in front in the 50th minute.
United, though, could not find a second goal, with Daniel James failing to turn in a ball across the six-yard box from Mason Greenwood.
It proved costly as Milan forced a dramatic equaliser in stoppage time when defender Kjaer headed in.
The Czechs – who knocked out Leicester in the last round – took the lead in the sixth minute through a curling shot from Nicolae Stanciu.
The Light Blues equalised 10 minutes before half-time when Filip Helander tapped the ball in from close range after a deep free-kick was knocked through the Slavia penalty area.
Goalkeeper Allan McGregor produced a fine late save from Lukas Masopust to give Rangers every chance in the second leg at Ibrox.
Ajax beat Young Boys 3-0 to take control of their last-16 tie.
Midfielder Davy Klaassen broke the deadlock just after the hour when he drilled in a 20-yard effort.
Former Southampton frontman Dusan Tadic drilled in a second with eight minutes to go, and substitute Brian Brobbey beat the offside trap to score a third in stoppage time.
Defender Pau Torres put the Spaniards ahead on the half-hour from a corner, with captain Raul Albiol adding a second in the 52nd minute when he knocked in a rebound.