* EU troops could play role stabilising post-war Syria
* Intervention now would worsen things, adviser says
* EU planners decided against sending force to Mali
By Adrian Croft
BRUSSELS, Jan 29 (Reuters) - European Union planners are looking at ways to help stabilise Syria when the civil war is over, and sending an EU military force to keep the peace could be an option, the bloc's top military officer said on Tuesday.
The EU has a 2,000-strong rapid reaction force, known as a battle group, on standby at all times, ready for peace keeping or humanitarian action in an emergency, but it has never yet been deployed.
Western nations are reluctant to get involved in the conflict in Syria, where more than 60,000 people have been killed in a 22-month uprising against President Bashar al-Assad.
French General Patrick de Rousiers, head of the EU Military Committee, said nobody believed an outside military intervention in Syria at present would improve the situation.
"It would worsen it at this stage. But this can change and depending on the way that it changes, then the EU can play a profound role because there will be the need to stabilise (the country)," de Rousiers told reporters.
Once the conflict eases, there will be a need for development projects and measures to prevent renewed fighting, he said. "So in this case, yes, a battle group could be useful, could be an option, but it is not the only one."
There were other ways the EU could respond, he said, without elaborating.
"It will really depend on the situation. What is needed now is that we think ahead and this is what is being done here - internal discussions in order to see a whole range of options of what could be put forward," he said.
De Rousiers, who acts as military adviser to EU foreign policy chief Catherine Ashton, said the ideas were being discussed within the EU's foreign service and had not yet been proposed to the EU's 27 states, some of which would probably object to putting EU peacekeepers into a hostile situation.
The standby EU battle group rotates every six months with different member states taking turns to participate. At the moment, it is led by Poland with French and German support.
De Rousiers also said that EU planners had discussed sending the battle group to Mali, where French forces have intervened to help the Malian army fight Islamist rebels, but had decided against deploying it.
"I had discussions with the chiefs of defence of those three nations - Poland, Germany and France - and there was also an assessment, a military assessment," he said.
He said an immediate reaction was needed when the rebels advanced south this month but deploying the EU battle group would have required the agreement of all 27 EU nations, a possibly lengthy process. France intervened quickly on its own.
Another argument against sending the EU battle group was that it would have added a second military chain of command to that of the French and Malian troops and a planned West African intervention force, complicating matters, he said.
"So from purely a military point of view, I think it was not the adequate tool," he said. (Reporting by Adrian Croft; Editing by Robin Pomeroy)