Guillermo Varela (right-back) – The Uruguayan youngster has made three appearances this season for the Red Devils and with more defensive injuries, he could see himself in regular action soon enough. Rio Ferdinand has spoken about his attack minded tendencies and Zinedine Zidane loved the player while he was on loan at Real Madrid Castilla, insisting hed make it to the top. 5 Will Keane (striker) – If Louis van Gaal is worried about a lack of goals at Manchester United he should give Keane a role in his side. He wasnt that prolific for Preston North End earlier this season while out on loan but appears rejuvenated back at Old Trafford having scored four goals in three games. Find out which five Manchester United starlets could save them a fortune, starting with James Weir (midfielder). Click the right arrow for more… – The 20-year-old is currently impressing for Man Uniteds Under-21s and has even captained the side. Hes creative and economical with possession, while also quick of foot. He was on the bench for their 3-3 draw with Newcastle and could craft chances if given an opportunity by Louis van Gaal. He scored for their Under-21s in their latest victory, which was a 1-0 win over Sunderland. Andreas Pereira (midfielder) – The Brazilian starlet is clearly very talented and is already a regular fixture on Manchester Uniteds bench but has still only made three appearances as a substitute in the Premier League. In cup competitions he has two starts and two substitute showings, while he also grabbed a goal against Ipswich in the League Cup. Many Man United fans would welcome his skill and guile in midfield. 5 Manchester United are currently floundering in fifth place in the Premier League and a transfer window boost is the shot in the arm they need.Currently, though, the Red Devils seem unlikely to do big business this month so it might be up to some homegrown starlets to provide some joy at Old Trafford before the season ends.Man United’s academy has come in for some stick recently as their Under-18s underperform, but players like Cameron Borthwick-Jackson and Paddy McNair have featured regularly this year and done well.And there are plenty of other youngsters in Warren Joyce’s impressive Under-21 side who could bring some sparkle, and some steel, to the first-team before the end of the campaign.So who are these youngsters? talkSPORT takes a look.Click the right arrow above to see five starlets who could save Manchester United a fortune this January… 5 5 5 Callum Gribbin (midfielder) – Dont let Gribbins slight figure sway you, the midfielder is extremely promising. Excellent with a set-piece, creative and able to produce brilliant moments with his sleight of foot, the 17-year-old is pretty strong too, despite his slender frame. Hes adding to his work-rate and his defensive ability as he develops too.