Macron spoke after a meeting on Ukraine in Paris brought together over 20 European heads of state and government and other Western officials in Paris.
"There's no consensus today to send in an official manner troops on the ground. But in terms of dynamics, nothing can be ruled out," he said.
Macron declined to provide details about which nations were considering sending troops.
He added that "we will do everything needed so Russia cannot win the war."
The meeting of European leaders was aimed at sending Russian President Vladimir Putin a message of European resolve on Ukraine and to counter the Kremlin's narrative that Russia is bound to win a war in its third year.
"I have noted that more or less all the countries represented around this table have said ... that the common consensus was that we should be ready in a few years' time, for Russia to attack these countries," Macron said.
"We all agree we don't want to go to war with the Russian people but we're determined to keep escalation under control," he said, adding that the meeting was meant to see how to "do more in terms of military support and budget support".
Macron invited European counterparts to the Elysee Palace for the hastily arranged meeting to discuss how to ramp up ammunition supplies to Ukraine amid what his advisers say is an escalation in Russian aggression over the past few weeks.
"We want to send Putin a very clear message, that he won't win in Ukraine," a presidential adviser told reporters before the meeting.
"Our goal is to crush this idea he wants us to believe that he would be somehow winning."
After initial successes in pushing back the Russian army, Ukraine has suffered setbacks on eastern battlefields, with its generals complaining of shortages of arms and soldiers.
Addressing the leaders via videolink, Ukrainian President Volodymyr Zelenskiy backed Macron's warning about an escalation of the conflict: "We must ensure that Putin cannot destroy our achievements and cannot expand his aggression to other nations."
Ukrainian President Volodymyr Zelenskiy says Russian forces could threaten other European countries. (EPA PHOTO)
Macron, who is due in Kyiv in March, was keen to seek solutions after a security conference in Munich this month, which coincided with the death of Putin's leading domestic opponent Alexei Navalny, failed to make progress.
Meanwhile Putin promised to increase the mobility and striking potential of Russia's special operations forces.
"We will continue to strengthen the Special Operations Forces, increase their mobility and striking potential, and arm them with new-generation weapons and equipment," Putin said in a congratulatory video message issued ahead of the February 27 Special Operations Forces Day in Russia.
"Let me emphasise that this is one of the key priorities for the long-term development of the army and navy."
Vladimir Putin promised to increase the striking potential of Russia's special operations forces. (AP PHOTO)
Russia's Special Operations Forces are strategic-level, constant combat prepared forces designed to perform specific tasks and are part of the Russian Armed Forces.
The special forces have been involved in Russia's covert actions in Syria in the past decade and since 2022 in Moscow's invasion of Ukraine, which Putin calls a "special military operation." Kyiv and its allies view it as an unprovoked imperialistic land grab.
"Special words of gratitude to the soldiers who have participated in the special military operation," Putin said in the video posted on the Kremlin's Telegram messaging app.
"In the most dangerous areas - on the front line, deep behind enemy lines, in raids and rapid attacks you carry out your assigned tasks with honour, act boldly, competently, and decisively."
with PA
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