German Chancellor Angela Merkel's Christian Democrat party may face a new coalition as recent polls show that their Bavarian sister party is only just above the 5% threshold for staying in parliament.
Should the Free Democrats (FDP) fail to be re-elected, Ms Merkel may be forced into a "grand coalition" with the Social Democrats (SPD), like her first government of 2005-2009.
Such uncertainty would affect weaker economies on the euro zone's "periphery", pushing up yields on the likes of Spanish and Italian debt relative to Germany's, the euro zone benchmark.
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Chancellor George Osborne will seek to reassure financial markets on Monday morning following Britain's decision to leave the EU.
In his first outing since the referendum result, the lead Leave campaigner has outlined his vision for a post-Brexit Britain.