Wouldn't be surprised in the slightest if we don't add a right-back in the coming weeks. Now Valencia is by no means an exceptional fullback or a great offensive option - but he's always fit which is a big positive in the manager's books, got better with experience at the defensive aspect of the position, really tries to apply himself, and can do all the thankless donkey work that Van Gaal asks of him.
Some of the names being mentioned while better or more natural at the position, don't inspire a lot of confidence, and are not going to be significant upgrades over him considering the prices the selling clubs will demand. I think rebuilding the spine of the team (center-back, central midfielder, probably a striker and goalkeeper if De Gea ends up leaving) will be priority this season, something that Northcroft alluded to. That said, Coleman might be one of the better options if we do end up signing one. He might not be a world-class right-back per se, but is quite consistent, has a decent fitness record, good crossing ability, has great decision-making and is adept at playing in a possession oriented team. Plus he chips in with a few goals each season, and is about to enter his prime performance years. The biggest reservation is that he has never played for a club of United's stature. Can he handle the step-up and be more consistent with his performances ? Some players just can't make the transition from a smaller pond.
Anyway that aside, I'd like to see Varela being given a chance this season. He showed good potential in limited playing time for the Uruguay U-20 team that reached the final on the back of their defensive performances, and did rather well at United reserves conditioning some of the personal and acclimatization issues he faced. Didn't follow him that much at Madrid Castilla but apparently he made over 30 appearances which can only be a good thing. He might be a part of the solution, and could be groomed into a more than capable right-back depending on his performances on tour so there's that. We should try to give more chances of our youth players, as I believe Van Gaal will in due time. Unless there's a glaring hole at the position which demands more immediate attention, which I don't think is the case at right-back. Valencia is serviceable for the time being.