On February 1st and June 30th, players' clubs let contracts slip leaving them free agents. Players like Sol Campbell, R. Kovac, Serginho will become available.
On July 1st, legends can appear on the transfer market and can also get picked up by the scouts during season (for example, Ravenelli by the transfer market and Campos by the scouts).
During a season, a player will get injured. This cannot be prevented. For example, if Ronaldinho gets injured for six month during a match and you restart, the same thing may happen to another player. Save the game after every match.
Finish as expected at end of season or better and also win cups. If V.I.P. guests watch matches, you win get ٣ or 6 million on the spot.
When contracts are up for renewal, offer the exact same terms. The players will usually take it.
Retired players get reborn as young players from 16 to 18 in the young squad. When this happens, promote them. This happens about a year or two after they retire, with players such as Larsson, Del Pierro, Roy Keane, Thuram, Nedved, etc.