text: Manchester United's Radamel Falcao believes Manchester City counterpart Sergio Aguero is his side's biggest threat. The Colombian striker was speaking at the #HeadtoHead for Puma's 'evoSPEED 1.3' alongside the Argentine when he spoke highly of this weekend's Manchester derby. Falcao said: 'They are a very talented team, with a danger all over the pitch, but Sergio Aguero has been a really dangerous player for Manchester United in the past matches. Manchester United striker Radamel Falcao believes Sergio Aguero is his side's biggest threat on Sunday . Argentina international Aguero has scored six times against United since he joined City in 2011 . 'He scored many goals, and always needs to be watched carefully. If there is one player more than others to watch out for, I'd say it is Aguero.' Falcao did not feature at the Etihad earlier this season but is fully aware of what the derby means in the city. 'It really means a lot to our fans and theirs, so of course I'd be thrilled to play in this match on Sunday. The atmosphere will be phenomenal,' he said. 'In Manchester the derby means a lot. Unfortunately I didn't play in the derby earlier this season, but you could sense the atmosphere in the city for more than a week before the match itself, it was all people were talking about.' Falcao and Aguero came face-to-face at a Puma event on Thursday . Falcao (right) says he is happy at United despite playing a bit-part role for much of the season . Falcao says he is happy at United despite having to settle for bit-part role under Louis van Gaal. 'Every football player wants to play, that's very normal, but I respect the manager and the decisions he makes,' he said. 'I keep working hard in training, learning every day how to play in different systems, in different styles of football. 'Manchester United is a great club, I am very happy to be here and because of this I am happy to be patient.'
target: Manchester United welcome Manchester City to Old Trafford on Sunday .
  Sergio Aguero has scored six goals against Man Utd since joining City .
  Radamel Falcao says the Argentine is the main threat for Man United .
  Falcao is hoping to make his first appearance in a Manchester derby .
  Colombian says he is happy at Man Utd despite bit-part role this season .