Conversation so far:
What was a goal Lionel Messi broke in 2012?
On 7 March, Lionel Messi scored five times in a Champions League last 16-round match against Bayer Leverkusen, an unprecedented achievement in the history of the competition.

Question: who did he play for?
Self-contained rewrite: who did Lionel Messi play for in 2012?