With only the group winners qualifying automatically, German coach Joachim Loew was careful to point out that Sweden were not a one-man team.
"Sweden is not only Zlatan Ibrahimovic," said Loew. "He is their key player, but they also function as a team very well. Iit's difficult to score against them."
Northern Ireland manager Michael O'Neill has set his players the unenviable task of ensuring Cristiano Ronaldo's big day proves a damp squib at the Dragao Stadium. The Portugal forward will win his 100th cap in tonight's Group F qualifier.
O'Neill has decisions to make in midfield, where the absence of injured trio Chris Brunt, Shane Ferguson and Grant McCann will be felt particularly keenly. Paddy McCourt is among those hoping for a call-up.