Saturday's drab 0-0 draw at Sunderland wasn't just a missed opportunity for three points—it was a stark warning for Manchester United's summer transfer strategy. The Red Devils can't afford to focus solely on signing first-team starters if they hope to avoid another Champions League collapse. To compete on multiple fronts, the squad depth needs a serious overhaul.

All confidence of a positive result at the Stadium of Light evaporated the moment Casemiro and Benjamin Sesko were ruled out. If that stalemate was an audition for next season's squad, the replacements clearly didn't earn a callback. Mason Mount and Joshua Zirkzee join Altay Bayindir, Tyrell Malacia, and Manuel Ugarte in looking blatantly surplus to requirements.

Worryingly, even some regular starters can't consider themselves untouchable. A ruthlessly honest assessment suggests that Lisandro Martinez and Amad Diallo—both of whom featured at Sunderland—could also be vulnerable if United want to raise their standards.

Now is the time to be positive. Realistically, United rotated heavily in the North East because their job is nearly done: Champions League qualification is secured, and third place will soon follow. But we can't ignore the pattern. Seeing such a startling drop-off when a few key players are missing isn't new, and with an eye on next season, that's a genuine concern.

A busier schedule awaits, thankfully. No one is complaining about the Champions League anthem returning to Old Trafford. But can United really expect Harry Maguire, Luke Shaw, or even Bryan Mbeumo—who has never played European football—to start every match? The answer is no. If United are serious about challenging for the Premier League title by 2028, the time to get aggressive in the transfer market is now.

Yes, this summer is complicated by the World Cup, uncertainty over the head coach, and the challenge of moving on players who need replacing. But if the Red Devils fail to prepare for the demands of their Champions League comeback, they risk crumbling back to square one.