The last-eight rubber looked to be heading for a goalless draw before Havertz latched on to Gabriel Martinelli’s ball to deliver a fine finish.

The Premier League leaders needed a last-minute Havertz penalty to avoid only their fourth defeat in all competitions this season.

The Gunners were trailing to Robert Andrich’s goal – from a corner, of all things – with a minute of normal time remaining.

The Arsenal forward required surgery on a serious hamstring injury last term, and then needed a knee operation earlier this season.

Mikel Arteta’s side are one match away from ending their six-year wait for a trophy after they saw off Chelsea at the Emirates to reach the final.

The German notched his first goal in almost a year.

Havertz suffered a serious knee injury on the opening weekend of the season.

Havertz was without a goal or assist in his first nine Gunners appearances.