(ATHENS) — Left-wing Greek election winner Syriza gained key support from an anti-bailout party Monday, allowing it to form a new government. The right-wing Independent Greeks party said it would back Syriza leader Alexis Tsipras to be the next prime minister, after he fell just short of the majority needed to govern alone, following Sunday’s poll. The suprise alliance between two staunchly anti-bailout parties, spooked markets and triggered a loss of nearly 4 percent on the Athens Stock Exchange as well as elsewhere in Europe. Tsipras has promised to renegotiate Greece’s massive bailout agreements, but has promised not to take any unilateral action against lenders from other eurozone countries. With 99.8 percent of the vote counted, Syriza had 149 seats in the 300-member parliament with 36.3 percent of the vote.