It's easy to forget that at one stage Lionel Messi could have joined Manchester City, while Erling Haaland could have ended up across town at Manchester United. Would the entire course of Premier League history have changed if Cristiano Ronaldo had moved to Arsenal instead of United in 2003?
Here we pick the top transfer "what ifs" for the biggest clubs in England that could have had major ramifications -- good or bad -- on the future of each side in recent years.