The eurosceptic Sweden Democrats said they would “take down” any formed government which does not allow it to have influence, after stealing a large percentage of votes from the two main parties.
And Mr Lofven must fight off pressure in a vote on his future, set to be held in two weeks if he does not step down before.
Sweden faces lengthy coalition talks to form a government, which is made all the harder by both major political alliances on the centre right and centre left freezing out the eurosceptic Sweden Democrats.
Sunday’s election produced a near dead-heat between the ruling centre-left bloc, which includes previous leaders the Social Democrats, Green and Left parties on 40.6 percent of the vote and the opposition centre-right, which includes the Moderates, on 40.4 percent.
The Sweden Democrats won 17.6 percent, but each bloc has ruled out working with the eurosceptic party because of its roots in the neo-Nazi movement.
vCard.red is a free platform for creating a mobile-friendly digital business cards. You can easily create a vCard and generate a QR code for it, allowing others to scan and save your contact details instantly.
The platform allows you to display contact information, social media links, services, and products all in one shareable link. Optional features include appointment scheduling, WhatsApp-based storefronts, media galleries, and custom design options.
The centre-right alliance, which includes the Moderates, Centre Party, Liberals and Christian Democrats is in turmoil on how to deal with the anti-immigration Sweden Democrats.
Two of the four centre-right parties yesterday turned down an offer of coalition talks from the Sweden Democrats.
Leader of the Sweden Democrats, Jimmie Akesson, said: “We won’t participate in letting through a government which doesn’t give us influence.
“On the contrary, we will do what we can to take down any such government.”
Mr Lofven, leader the Social Democrats, indicated he would seek to remain prime minister.
The left-wing leader has called for a “burial of bloc politics” and seemed to seek help from the Centre and Liberal parties to rescue him after leading the Social Democrats to their worst electoral performance for more than a century.
Almost all votes from polling on Sunday have been counted with final results to be known tomorrow.
This includes overseas and late ballots which have usually been cast more for the centre-right.
A new election will be called if parliament doesn’t agree on a prime minister after four attempts.
Mr Lofven have a minuscule two-mandate lead over the centre-right opposition, with 144 seats against 142.
But in just eight years, Sweden Democrats have more than tripled their backing from the Swedish population.