Video assistant referees (VAR) will be in use at Anfield for Liverpool's Champions League last-16 tie against Bayern Munich on Tuesday night.

In December, UEFA’s Executive Committee approved the deployment of VAR for the knockout phase of the 2018-19 tournament.

UEFA’s VAR guidelines

There are four ‘match-changing’ situations VAR can be used for and only when there is evidence of a clear and obvious mistake.

1. Goals

2. Incidents in the penalty area

3. Red cards

4. Mistaken identity

If the situation relates to one of these four incidents, the referee can use the assistance of VAR. If it isn’t one of the four incidents listed above, then they can’t.