Ireland, Slovenia and Portugal opened euro zone government bond deals for 2020 on Tuesday, with analysts expecting heightened geopolitical risk to mean new supply should be easily absorbed by investors keen to hold fixed income.

January is usually a busy period for government bond sales, both at auctions and via bank syndications, with Tuesday's flurry of syndicated bond deal announcements expected to boost issuance volumes for the month.

Slovenia launched a 10-year bond deal, while Ireland is looking to raise around 3 billion euros from a 15-year bond, a market source told Reuters. Portugal, meanwhile, has mandated banks to manage the sale of a new 10-year government bond, maturing in October 2030, soon, sources said.