From my research, it seems that pro soccer players don't exactly eat whatever they want during the off-season. While they may indulge in some favorite foods they avoid during the season, most players maintain a balanced diet to keep their bodies in top shape. Off-season doesn't mean off-duty for these athletes, and maintaining their fitness levels is crucial for the upcoming season. However, portion control and balance are key, and a little bit of indulgence can actually be beneficial for their psychological health. In short, it's not a free-for-all, but there is a bit more leniency in their diet.