That seems unlikely to me - passing is considered one of Maguire's fortes, and Lindelof is good at it too. Not a weakness of Varane's either, though he is probably the weakest of those 3 in that department. My money would be on our problems playing a high line, not just because of limited pace in the backline, but equally because of what's in front of and behind them: A midfield with little ability to control space defensively, and a keeper who largely stays on his line.
But who knows. There's talk now of wanting two new CBs, so it has to be something.