Italy has said border restrictions at the important Brenner Pass north-south transport link would be unjustified given the small number of migrants arriving there, but Austria says it expects a wave of migrants to head north soon.
Italy's Prime Minister Matteo Renzi denounced the plans, saying it was "shamelessly against European rules, as well as being against history, against logic and against the future".
The Brenner Pass is the busiest route through the Alps and any controls there, if introduced, will slow traffic on Italy's main transport link to Germany, its top trading partner.
Outlining Austria's plans for the Brenner Pass, on which building work began two weeks ago, the police chief of the province of Tyrol told reporters they included a 400-metre fence, the Tiroler Tageszeitung newspaper reported on Wednesday.
Whether the fence is built will depend on Italy's willingness to cooperate, the police chief, Helmut Tomac, told reporters at a news conference, the paper said on its website.
The plan includes installing three checkpoints on the motorway running through Brenner, news agency APA said, citing police officials including Tomac.
A spokesman for Tyrol's police said he could not immediately confirm the reports.
