Every year since FUT 12, in early January, EA Sports build a team of players based on their real performance on the previous year. The players of this TOTY are selected from the voting of FIFPro, the world wide professional footballers association, and announced in the FIFA Ballon d’Or Gala. They are supposed to be the best players in the world.
They are upgraded with a blue TOTY card which becomes available in packs for a week (two days for each position and a final day with all players together). In the week a player gets his TOTY card in packs, it is impossible to find his regular card there. Your odds of pulling a TOTY card from a pack are exactly the same of pulling the regular card of that player in another week.
If you own the regular card of a TOTY player, your card will keep unchanged. If you want the improved version, you will need to buy the corresponding TOTY version in the market or pull it from a pack.
The players ratings and stats of TOTY cards are usually boosted in six or seven points. The position of the players in these cards may change if, in the previous year, they played really well in a new position.
The Team of the Year is released once per year. It means that these very special blue cards are assigned only to eleven players (one goalkeeper, four defenders, three midfielders and three forwards), that can be of any league and category. Usually they are all gold and play in the BBVA, Barclays and Bundesliga.
You can have the regular card and the TOTY card of the same player in your club. However, you cannot use them both in your squad at the same time.
Excepting the Pro Players and the special cards, these ones are usually the most expensive cards of the whole FUT 15.