Kelvin Leong loves the subplots that will be played out when the Champions League Round of 16 kicks off!

Five men will return to their former stomping grounds in a bid to oust former team-mates and managers from the UEFA Champions League.

Which of the five men will inflict the most damage on their old clubs?

Aliaksandr Hleb vs Barcelona

Arguably the most famous Belarusian footballer of his time, Aliaksandr Hleb made his name as an intelligent winger at German side, Stuttgart, before crossing the channel to join Arsenal.

Despite spending a rewarding four years as a Gunner, he was allowed to leave the club and he signed on for Spanish giants, Barcelona.

His Catalan career never quite took off as he was used mostly as an impact player off the bench.

Currently on-loan back with the Swabian side, Hleb will be determined to put one over Pep Guardiola who never gave him enough game time to make an impression.

Hleb is the creative spark for the Germans and if he can deliver the kind of football he showed in England, Barcelona could be left with a bitter taste in their mouths.

David Beckham vs Manchester United

Just days before the UEFA Champions League draw in Nyon, Golden Balls stated his dream of facing Manchester United as he returns to AC Milan for a second loan spell.

Your wish is my command Sir!

Becks will face Sir Alex Ferguson and his mighty Red Devils in the Round of 16. After some 265 games in a United jersey, England's finest dead-ball specialist will now take aim at the man who famously caught him with a flying boot in the dressing room.

Can Beckham rally an ageing Milan side who seem to be having trouble regaining their status as one of Europe's biggest clubs or will Ferguson be shaking hands with the England midfielder after the game with a smirk on his face?

The last time Beckham represented Milan, he became an instant hero for the Rossenneri.

This will be one of Beckham's biggest games in an illustrious career. Can he boot the Red Devils out of Europe? Pun intended!

Jose Mourinho vs Chelsea

As the media eagerly anticipated the Round of 16 Draw in Nyon, the main talking point was whether ‘The Special One' will be presented with a tie against his former side.

Just like Beckham vs United, fate had it that Mourinho should be given a chance to face Carlo Ancelotti's Blues.

Ironic as it may be, Mourinho, the same man hired by Roman Abramovich to win the Champions League trophy could be the one to thwart the Russian mogul's longtime dream.

The Portuguese has shaped and groomed his current Inter side into a similar style he imprinted on Chelsea so this tie will most likely come down to individual brilliance.

Will Samuel Eto'o give Mourinho bragging rights at least till the next time the two sides meet or can Didier Drogba come back to haunt his favourite manager?

Luca Toni vs Fiorentina

Whether Toni will be around when Bayern Munich take on his former club, Fiorentina is a big question mark.

His future at Bayern is in doubt but if he sticks around long enough, Toni will probably get a resounding reception against Fiorentina.

47 goals in 67 appearances for the Florence side showed just how prolific he was for them before making the move to Bayern in 2007.

Despite his problems with manager, Louis Van Gaal, Toni's goalscoring ability cannot be questioned.

38 goals in 59 games for the Bavarians is a terrific record.

The only question left is whether Bayern will give him a chance to destroy his former employees.

Karim Benzema vs Lyon

Benzema joined the Los Merengues as one of the new gladiators in the summer and has started to show the scintillating form that made him one of the hottest properties in world football last season while playing for Lyon.

He terrorised Ligue 1 defenders with his direct attacking style for six years before his move to Spain and the most alarming fact is that he is still only 22 years of age!

43 goals in 112 matches for Lyon should see him return to a standing ovation at the Stade Gerland but what better way for Raul's successor to warm the hearts of Madrid fans by scoring against his former club to show his true allegiance?