WREXHAM, Wales, March 7 (Reuters) - Chelsea's Alejandro Garnacho and Joao Pedro struck in extra time to secure a nervy 4–2 win over second‑tier Wrexham and a place in the FA Cup quarter‑finals on Saturday as the Premier League giants escaped from the Racecourse Ground after a tough battle.

Garnacho volleyed home from close range in the 97th minute with such force that the ball ricocheted off the back stanchion to give Chelsea the lead for the first time on the night.

Wrexham -- who lost George Dobson to a 93rd-minute red card -- thought they had equalised deep into added time in the extra period when Lewis Brunt headed home but he was offside.

"It's such a shame, really, that our first taste of VAR has gone this way," Wrexham boss Phil Parkinson told TNT Sports.

Joao Pedro sealed Chelsea's hard-fought win with a close-range shot in the 125th minute.