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If anything, it's come too soon.

Every meeting between Boca Juniors and River Plate is played in a pressure-cooker atmosphere but one of world football's most intense rivalries definitely kicked up a notch after last year's Copa Libertadores final.

That was when we witnessed shameful scenes ahead of the second leg when the Boca team bus was attacked en route to River's Estadio Monumental, causing injuries to several players and the match's relocation 6,000 miles to Madrid on safety grounds.

Superclasico rivals Boca Juniors and River Plate are set to meet in the semi-finals of the Copa Libertadores, just 10 months after chaos before the second leg of the competition's final when River supporters attacked the Boca team bus

Superclasico rivals Boca Juniors and River Plate are set to meet in the semi-finals of the Copa Libertadores, just 10 months after chaos before the second leg of the competition's final when River supporters attacked the Boca team bus 

There were clashes between River fans and riot police after the second leg of last year's Copa Libertadores was suspended

There were clashes between River fans and riot police after the second leg of last year's Copa Libertadores was suspended

The Boca team bus, seen here leaving their stadium en route to River's last November, was attacked with bottles and missiles

The Boca team bus, seen here leaving their stadium en route to River's last November, was attacked with bottles and missiles

Windows were smashes by the projectiles with players injured by flying glass and inhaling tear gas fired by riot police

Windows were smashes by the projectiles with players injured by flying glass and inhaling tear gas fired by riot police

Just 10 months on and tensions have hardly eased as these two fierce foes prepare to meet again in the semi-finals of the same competition.

No chances are being taken in the countdown to Tuesday night's first leg at the Monumental, which will be heaving to its 70,000 capacity, a swaying sea of red and white.

As has become customary because of spiralling violence a decade ago, there will be no Boca supporters at their 'away' leg and more than 1,000 police officers will be on duty to keep the peace in Buenos Aires.

In advance of the game, police arrested 10 members of River's most notorious ultras, or barra brava as they are known in Argentina, and seized weapons and drugs.

What's more, River fans will be kept 150 metres away from the Boca team bus as it arrives at the stadium to avoid a repeat of last year's scenes when volleys of flying projectiles smashed the windows and tear gas seeped through, leaving the some shaken and struggling to breathe. 

River fans detained by police following their role in the shocking scenes of violence before the final last November

River fans detained by police following their role in the shocking scenes of violence before the final last November

River fans fought running battles with riot police after the second leg of the final was postponed after the bus attack

River fans fought running battles with riot police after the second leg of the final was postponed after the bus attack

Boca player Pablo Perez suffered an eye injury as the result of flying glass when the windows of the bus were smashed

Boca player Pablo Perez suffered an eye injury as the result of flying glass when the windows of the bus were smashed

Copa Libertadores semi-finals 

FIRST LEG

October 1

River Plate vs Boca Juniors

Estadio Monumental

(Kick-off 1.30am UK time on Wednesday October 2)

SECOND LEG

October 22

Boca Juniors vs River Plate

La Bombonera

(Kick-off 1.30am UK time on Oct 23)

With the stadium already packed inside, kick-off was repeatedly pushed back as the Boca players were patched up before eventually being postponed with police admitting they couldn't guarantee the safety of the team.

CONMEBOL, South American football's governing body, decided three days later that the second leg would be played outside Argentina on safety grounds with 's Bernabeu the venue chosen.

When the game was eventually played on December 9, River defeated Boca 3-1 in extra time, winning the tie 5-3 on aggregate following the 2-2 first leg draw at Boca's Bombonera.

The authorities are desperate to avoid a repeat of the violence this time round. A league fixture between these teams passed off without incident earlier this month, finish in a tense goalless draw.

But again the stakes will be enormous. Boca have heard plenty of bragging in the past 10 months after what was billed as the 'Final to end all finals' and will be desperate to take their revenge. 

The second leg at the Bombonera takes place on October 22 and the winners will face one of the Brazilian pair of Gremio or Flamengo in the final next month. 

The second leg was switched to Real Madrid's Bernabeu and River won the tie 5-3 on aggregate after extra time

The second leg was switched to 's Bernabeu and River won the tie 5-3 on aggregate after extra time

This led to wild scenes of celebration back home in Buenos Aires as River celebrated their fourth Copa Libertadores

This led to wild scenes of celebration back home in Buenos Aires as River celebrated their fourth Copa Libertadores

River fans packed the Plaza de la Republica in Buenos Aires to celebrate all night after they defeated their rivals Boca

River fans packed the Plaza de la Republica in Buenos Aires to celebrate all night after they defeated their rivals Boca

For the first time - and this decision was taken before last year's carnage - the final will be played over one leg at a neutral venue. This year it is the Estadio Nacional in Santiago, Chile.

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