Football terraces, which were phased out at big grounds after the Taylor report into the Hillsborough tragedy, could be brought back under the Tories.
Some MPs want to review the case for reinstating standing areas
Conservative leader David Cameron vowed to review the ban taking into account the views of fans, police and clubs.
Safety had to be "priority number one", he said, but there may be a way to organise limited standing areas.
All-seater stadiums were recommended after 96 people were crushed to death in Sheffield's Hillsborough stadium.
Football clubs in England's Premier League are legally obliged to have all-seater grounds.
In response to a question on the Tory leader's website, asking about the possibility of reinstating standing areas, Mr Cameron said: "Obviously the first principle here has got to be safety first after the dreadful events at Hillsborough."
"But I do understand the point that other countries manage to organise things in a slightly different way, and there may be some more modern ways of organising the limited standing areas."
He said he would ask his sports minister to review existing regulations and "have a really good look at this".
"But priority number one has got to be safety," he said.
'Act of folly'
More than 100 MPs have signed an early-day motion from Lib Dem MP Mike Hancock to "re-examine the case for limited sections of safe standing areas".
When then sports minister Kate Hoey suggested a return to "safely designed standing areas" at Premier League grounds in 2000, she angered the families of Hillsborough victims.
Hillsborough Family Support Group chairman Trevor Hicks said it was an "act of folly" and accused her of "fiddling with safety".
Sports minister Richard Caborn, who was MP for Sheffield Central at the time of the Hillsborough disaster, is opposed to reintroducing terraces.
But he has agreed to meet supporters of the campaign because of the support for the early day motion.