manchester united's first team squad were in full flow at training on friday, as they prepare for a season defining clash at liverpool the rivalry between the two clubs goes back a long way, but in terms of money, this sunday's game is more important than most of the previous ties louis van gaal put his charges through their paces ahead of a game that could define their finishing position this season antonio valencia (left) fends off the challenge of manchester united loanee radamel falcao during training at their carrington base on friday  louis van gaal will have to decide whether to stick with juan mata (right) on sunday, or revert to the previously suspended angel di maria (left) there is no championship on the line, but instead fourth place and champions league qualification rests heavily on this weekend's match united currently sit fourth, two points ahead of liverpool, and will hope to extend the gap to five points with a win at anfield michael carrick has recently returned from injury to regain his place in the starting line up, and the oldest player in the united squad knows he must provide assistance to his team mates manchester united boss van gaal (second left) speaks to phil jones (left) during the session, as marouane fellaini watches on  defender luke shaw, signed from southampton, takes part in a drill as united prepare for an important trip to anfield at the weekend  friday's training session coincided with defender marcos rojo's 25th birthday ashley young wished him a happy birthday on instagram  'there is a responsibility that comes with the experience you have,' he told united review 'there is a lot of experience within the squad and there is also a group of younger lads and you try to help them and give them advice at certain times 'i'm not one to sit everyone down and discuss things; it’s more about giving advice and little pointers at different times' 'it's good to be back and i feel fine,' he added, when asked about his fitness 'once you get back, you just want a run of games and hopefully i can get that' david de gea dives to his right during the session; the goalkeeper's future at the club has been the subject of much speculation  marouane fellaini brings the ball down as jonny evans watches on (left) while captain wayne rooney carries a look of concentration (right) carrick missed the start of the season, before a run of games from december to january was halted by another injury he returned for united's game against newcastle in march, and has impressed since 'it's been a bit of a nightmare season for me injury wise,' carrick continued, 'and just at the time in my career where you’re getting a little bit older and you want to be playing as much as you can and enjoy your football 'i’ve had a good run over the years, though, and hopefully this is the only blip so i can bounce back and get a good run of fitness now' falcao (right) tries to round valencia during friday's training session at manchester united's aon training complex in carrington, manchester  the players keep hydrated during the session as they prepare for their huge match (left), and reserve keeper victor valdes makes a catch 
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