Position

A wide player in a back-three or back-five system who covers the entire flank. More attacking responsibility than a regular full-back - basically a full-back and winger combined. When defending, you're part of a back five. When attacking, you're up providing width. You need serious stamina because you're covering the whole touchline both ways.

A goalkeeper who specialises at playing high and 'sweeping' up behind the defence. They are generally quick to come off their line and are all about snuffing out the threat from the ball over the top of the defence. Bayern Munich's Manuel Neuer is often cited as the perfect example of the sweeper keeper.

An attacking midfielder playing as the focal of the attack rather than an out and out striker. The main purpose of this is to have an extra creative player who can drop in to the midfield as required and give the opposition centre backs something different to think about. Should the centre backs choose to track the false 9, the leave space behind for the wingers to exploit. Should they choose to not track, they leave a creative attacking player with space to do damage.

A big striker who wins headers, holds the ball up, and brings others into play. The team hits long balls to him, he brings it down or flicks it on, and teammates run off him. Different skill set from your typical striker: heading, shielding, strength, smart movement. Drogba, Andy Carroll, and Zlatan have all played the role. Less fashionable now with possession football everywhere, but still useful for certain tactics.

A centre-back who's good with the ball at their feet, able to play through a press and start attacks with forward passes. Modern systems that build from the back need defenders who can handle pressure and find teammates in tight spots. You still have to be able to actually defend, but now you need passing range and composure too. It's changed how clubs scout and develop defenders.