The Gunners centre-back has called time on a 10-year playing career at international level.
The Germany centre-back played for his country for over 10 years and amassed over 100 caps.
He ends his international career on the highest note possible, having helped Germany win the World Cup in Brazil.
Mertesacker made six appearances during the tournament but will now dedicate all of his playing time to Arsenal.
|Team||Pos||Tackles Won||Aerial Duels Won||Interceptions Won||Effective Clearances||Apps||Mins|
As Opta stats show, the 29-year-old won two tackles and five interceptions during the World Cup, although he fared far more impressively in terms of clearances and, unsurprisingly, in the air.
Arsene Wenger has confirmed that Mertesacker will not be in contention for Arsenal's opening two Premier League fixtures of the season, after returning to club duties late following his World Cup exploits.
However, the Gunners now know they will have the "BFG"'s full attention throughout the season, with no more international football to distract him.
Mertesacker's retirement age of 29 is relatively young, although his Germany career remains extremely distinguished nevertheless.
Will Arsenal benefit from Mertesacker's retirement?