Five signings that could have changed the history

Friendly
Round 57
LaLiga
Round 1
Premier League Summer Series
Round 1
Premier League
Round 1
MLS
Round 26
Dro Fernández
MF
ST
R. Bardghji
F
RW
M. Rashford
F
LW
Eric García
D
CB
Alex Murphy
D
CB
Barcelona
LaLiga
Arsenal
Premier League
Real Madrid
LaLiga
Newcastle
Premier League
Vissel Kobe
J1 League
Beckham and Ronaldinho (Real Madrid and Barcelona)
It seemed like Beckham at Barcelona was a done deal and Real Madrid had almost signed Ronaldinho but in the end it was the other way around.
Tim Sherwood and Zidane (Blackburn Rovers)
Blackburn were eyeing Zidane for a long time but they decided to sign Sherwood.
Cristiano Ronaldo and Quaresma (Valencia)
Valencia were working on a contract for Quaresma and Ronaldo but the deal didn't work out. Quaresma joined Barcelona and Ronaldo ended up in United.
Maradona (Sheffield United)
The British team were keen to sign the forward. He negotiated with the club but they didn't offer him enough money.
Messi and Puyol (Barcelona, Cadiz and Malaga)
Both had chances to join other teams before they became part of the first team. Rijkaard prevented that Messi joined Cadiz and Puyol rejected in the last minute to join Malaga. Time has proven they were right.