According to the FIFA Code of Ethics, players, coaches and all people involved on football is forbidden to place bets:
25 Integrity of matches and competitions.
Persons bound by this Code shall be forbidden from taking part in, either directly or
indirectly, or otherwise being associated with, betting, gambling,
lotteries and similar events or transactions connected with football
matches. They are forbidden from having stakes, either actively or
passively, in companies, concerns, organisations, etc. that promote,
broker, arrange or conduct such events or transactions.
The FIFA Code of Ethics covers Chelsea and Real Madrid players as well.
The English PFA (Professional Football Association) is very clear in its site:
Put simply the main message for players is: 'You are not allowed to place ANY bet on ANY football, ANYWHERE.'