Fullback (LB / RB): position, role, and responsibilities

What is a fullback, and where do they play?

The two outside players in a back four: left back and right back. This starting position is different from the direction they move when the team has the ball.

The diagram uses a 4-3-3 setup, attacking from left to right. Yellow markers identify the position being discussed; they are not average match coordinates. For left/right pairs, the top of the diagram is the attacking team’s left side.

Responsibilities in three phases

• In possession: Provide a wide outlet, combine with a winger through overlaps or underlaps, and move inside when the structure calls for it.
• Out of possession: Stop progress down the wing, manage crosses, and narrow the gap to the center back when the ball is on the opposite side.
• Transitions: Plan the recovery route when advancing, coordinating with center backs and midfielders to protect the space behind.

The tactical discussion draws on Coaches’ Voice — The modern full-back. The wording and exercise below are FootballCap’s own.

Position versus role

An inverted fullback moves centrally in possession; this is not simply a player stationed on the side opposite their stronger foot. Both fullbacks do not have to advance together.

Historical data: the Defender group

Measure in the historical dataset	Result
Records labeled Defender	1200
Records with height greater than zero	1174
Records without a valid height	26
Median height, cm	184

Source: Players — Pappalardo et al. (2019), CC BY 4.0. FootballCap recalculated these values from the original file. This is a transformed summary, not a table supplied by the authors.

Limitations: The dataset uses four broad labels and does not isolate LB / RB. These are historical player records pooled across competitions, not appearances or current-season statistics. Height does not measure tactical ability and is not a selection threshold. Do not use this figure as a standard height for this position. See the methods, four groups, and downloads.

What to watch

Record passes and carries that break lines, along with who covers when the fullback leaves the back line. Cross totals do not fully capture the work of a fullback who regularly moves inside.

A position-reading exercise

Place a fullback behind a winger. Try an outside run, then an inside supporting position. For each, mark where opponents could pass immediately after regaining possession.

Use three columns: what you see, alternative options, and what you cannot yet conclude. These are original exercises; repetitions on the tactics board are not player-performance data.

Keep exploring: inverted full back · All football positions · Open the tactics board.