Personally, I don't think we need another centre back in January. With Smalling, Jones, Evans, Rojo, Blackett and McNair, we have more than enough cover to fill two positions.
I keep changing my mind about this, but I'd like to see Di Maria as a centre midfielder, as most people do. He's obviously better there, which would mean we'd need another winger if we're going to continue playing a 433, as we only have Januzaj who can perform at a decent level there.
If I had my choice, I'd get a pacey right winger - similar to Walcott, who keeps the width, has great off the ball movement, and likes to use his pace to get in behind defences. I would choose this type of winger because I'd want to use Rooney as our left inside forward, who will be given the license to almost play as a second striker to whoever is playing up top. This will give Di Maria the chance to pick up the ball from deep, and drive into the left channel and use his great crossing ability - similar to when we played a 442 diamond.
I guess my team would look something like this:
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When we're defending, we can defend in a narrow 442, two banks of four, with Di Maria coming defending the left flank, and Rooney pressing from the front with his the other forward, which would look like this:
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