This formation was popular a few years ago and can be an effective way of switching between defence and attack.
The 3-5-2 has three defenders, five midfielders and two attackers.
The two wide midfielders are really attacking full-backs, so you could almost call it a 5-3-2 formation if you wanted to.
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Glenn Hoddle favoured this system when he was in charge of England.
Across the back line there are three central defenders - occasionally with one acting as a sweeper - so it provides good cover at the back if the two central defenders are vulnerable.
The two wing-backs, who operate up the flanks, play a key role in this line-up.
It allows them to attack and Brazilians Cafu and Roberto Carlos were masters at this.
The team that made this formation successful was Ajax
Former England coach
It is their job to work the full length of the pitch, supporting both the defence and the attack by getting crosses in and tackling back respectively.
If these two attacking defenders struggle with the pace of the game, the team can be left short of support, be it up front or at the back.
It does put a lot of responsibility on to the shoulders of just two players. They do need to be very fit.