The Spanish striker, who joined the Gunners from Deportivo La Coruña in the summer, scored his first goal for the club in the 60th minute of their 4-0 EFL Cup win over Nottingham Forest on Tuesday night.
Perez converted from the penalty spot to break his Arsenal duck before adding a second just over 10 minutes later when beating off competition from Michael Mancienne before rounding Vladimir Stojkovic and poking home under duress.
The debut double was certainly welcomed by the 28-year-old who was happy to get off the mark in what was an impressive performance which also included an assist for Alex Oxlade-Chamberlain's injury-time goal.
What a win! Glad I got to score my first goals for @Arsenal. Hopefully the firsts of many #YaGunnersYapic.twitter.com/MdxVG0Mrlb
— Lucas Pérez (@LP10oficial) September 20, 2016