David Moyes will start his first Champions League campaign of his career with Manchester United on Tuesday evening and the pressure will be cranked up higher than ever. But who do United to be wary of when they face the German opposition of Bayer Leverkusen? 

Stefan Kiessling - the 29-year-old has scored 115 goals in 288 appearances since moving from Nürnberg where he made 73 appearances and scored 10 goals.

Since his move to Leverkusen, he's been their main man for the last few years and at 6'3 he's a great target man. Although he is not known to be a prolific goalscorer, he is essential to the team as he brings other players into the game.

This helped Andre Schürrle shine and with Kiebling's help got him a move to Chelsea. Often the unsung hero, Nemanja Vidic and co. will have their hands full with this experienced and seasoned striker.

Sidney Sam - after his move from Hamburg SV in 2010 and signing five-year deal - has quickly established himself at the club making 98 appearances and scoring 28 goals in the process.

The tricky German winger is incredibly speedy and has a variety of tricks up his sleeve and can play on either wing.

He'll be incredibly important against United as he will be expected to cause Evra problems going forward but also to track him when the Frenchman goes the other way. Being only 25, Sam has a bright future with already two appearances for the German national team.

Simon Rolfes - known as a cult hero at the BayArena - Rolfes has become a fans' favourite since moving to Leverkusen in 2005, making 235 appearances.

The defensive midfield is adored by the fans due to his dedication, high work rate and sportsmanship. Although he's had a nasty spell of injuries in the past, he could be essential for Leverkusen's Champions League campaign with his experience vital for the team. 

Gonzalo Castro is another player United really need to keep tabs of is Gonzalo Castro. The 26-year-old, who can play in midfield or the right side of defence made his Champions League and Bundesliga debuts for Leverkusen at the age of 17.

Since being promoted from the youth ranks, he's made over 300 appearances for Leverkusen and is one of their most technically gifted players. He can make that defence-splitting pass and is constantly taking on the opposition.

With United unbeaten against Leverkusen in four games, it'll be a completely different game from 2003 and with a new manager in former Liverpool cult hero, Sami Hyypia, it should be an intriguing match on Tuesday at Old Trafford.

Moyes will be hoping he can start his campaign brightly or he risks more scrutiny which is the last thing he'll want as it'll crank the pressure up for the Manchester City game on Sunday. 

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