"We have always said that if we do not support local forces on the ground, if there is no land operation, it will not be possible to eliminate or even stop Daesh exclusively from the air", he said.
Erdogan s comments came two weeks after Turkey launched an ambitious operation inside Syria, sending tanks and special forces to back up Syrian opposition fighters and remove IS jihadists and Kurdish militia from its frontier. In the past, the United States and Turkey have announced ambitious new joint policies concerning Syria that failed to materialise as disagreements emerged over what had been agreed to.
Ankara's tactics have been criticized by its North Atlantic Treaty Organisation ally the U.S. and also by Russian Federation, with which it recently remedied ties.
"Our soldiers should get together and whatever needs to be done can be done", Erdogan said, adding that Turkey and the USA have been working in harmony so far in the operation against the Islamic State group.
Syria has been locked in a vicious civil war since early 2011, when the regime of Bashar al-Assad cracked down on pro-democracy protests - which erupted as part of the Arab Spring uprisings - with unexpected ferocity.
He said more would return gradually.
Turkey's defense minister said Saturday he hoped Syrian refugees would be able to return home safely after Islamic State is cleared from an area along the border between the two countries.
She said according to that agreement Turkey must not go beyond Jarabuus, but it has already started military operations in the region south from Jarabulus.
The Tuesday update says the United Nations has sent an "inter-agency convoy with life-saving supplies to Hama" and was evaluating the humanitarian situation.
Ousting IS from the city would be a turning point in the conflict.
Activists and rescuers said at least 70 people were treated for breathing difficulties after government helicopters dropped the suspected chlorine cylinders on al-Sukkari neighborhood.
Speaking to reporters on his plane back from the G20 summit in China on Monday, Erdogan said Turkey's military was ready to join any offensive on Raqqa, Islamic State's de facto capital.
Mr Erdogan gave few other details but said more discussions would follow. But there was no immediate comment from U.S. officials.