The additional Turkish infantry troops are needed to capture the town of Al-Bab from the jihadists, military sources told the Hurriyet daily, without specifying when the push might start.
The pro-Ankara rebels backed by Turkey captured Jarabulus from IS on the first day of the offensive and have since also taken several villages around Jarabulus and neighbouring Al-Rai.
But the sources told Hurriyet that taking Al-Bab would be a far tougher proposition.
The IS bastion of Al-Bab is 30 kilometres (18 miles) from Al-Rai on the Turkish border and in the battleground province of Aleppo.
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