The votes of Turks resident abroad have provided rich pickings for the ruling Justice and Development Party (AKP) in the past.
An overwhelming majority of the vote typically goes to the AKP, co-founded by Erdogan.
But ministers are also aware that expatriate turnout hovers at around 40 per cent -- much lower than the national average -- and getting these votes out could be crucial in tipping the balance.
Of those, over 56 per cent of the votes went to the AKP.
The key battleground is Germany, where almost half of the expatriate Turkish vote is concentrated but there are significant communities in several other EU countries.
Here are snapshots of European countries with the largest numbers of Turkish voters, with data from the last legislative polls in November 2015.
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