Mario Pasalic scored the winner seconds after coming off the bench as Atalanta came from behind to beat Roma 2-1 and consolidate fourth place in Serie A at the expense of their Champions League rivals from the capital.
The Croatia midfielder came on just before the hour mark on Saturday to fire in the crucial goal 19 seconds later, to boost confidence ahead of his side's first ever Champions League last 16 game against Valencia, not at their home 21,300-seater Gewiss Stadium, but at the much larger San Siro next week.
"This is an important victory," said Atalanta coach Gianpiero Gasperini.
"Against a side like Roma this advantage is not definitive. They are a strong team, but in us there is the belief that we can finish in front."
- 'Mental problem' -
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"There are still 14 games left, I think it is possible to fix it, even if it is difficult."