They did it with Cesc Fabregas and now FC Barcelona are reportedly ready to do the same with Spanish right-back Hector Bellerin.
Barca offloaded Fabregas to the Gunners when he was just a boy in 2003 and then re-signed him as a fully-grown man eight years later.
Bellerin left the Catalan giants for North London in 2011, but he is already being strongly linked with a return.
According to the Daily Mail, Barcelona will move to sign the rapid 21-year-old when the transfer window reopens in January.
The same newspaper claim that Manchester City will rival Barca for the player’s signature and that Bellerin is a priority purchase for both clubs.
Pep Guardiola could play a big role in persuading Bellerin to move north to Manchester, but the Daily Mail claim that City coach Mikel Arteta could be the guy who swings it.
Arteta joined Arsenal at the same time as Bellerin and the pair apparently became good friends at the Emirates, until the former Gunners skipper moved to City this summer.