Koscielny and Djourou had been sidelined with ankle and muscular problems respectively and missed the recent fixtures against Olympiacos and Tottenham.
A statement on the Arsenal site confirmed: "Following rehab at Arsenal, both players are now away on international duty but did not feature in Friday's Euro 2012 qualifiers. Koscielny was an unused substitute for Laurent Blanc's France side, while Djourou was suspended for Switzerland's 2-0 defeat at Wales."
The returning pair will give Arsenal's back-line a much needed boost as they resume their Barclays Premier League campaign against Sunderland this weekend.
Arsenal have lost four of their opening seven Premier League games and conceded an alarming 16 goals in the process.
New central defensive signing Per Mertesacker has come in for some stick as a result and the defender recently admitted he is still having communication problems at Arsenal.
The Germany international was one of several new faces brought in towards the end of the transfer window which also included Everton midfielder Mikel Arteta.
The Spaniard was brought in as a replacement for skipper Cesc Fabregas.