Appearing at this stage in European competition for the third time in five years, Jose Mourinho's side took a 15th-minute lead at the King Power Stadium through Lorenzo Pellegrini.

But the host equalised midway through the second half when Mancini inadvertently turned Harvey Barnes' cross into his own net.

It was enough to ensure a share of the spoils and leave the tie finely poised ahead of next week's second leg at Stadio Olimpico.

Leicester made a positive start to what was their first European semi-final. Just four minutes had passed when Timothy Castagne headed wide from a James Maddison corner.

Despite enjoying just 35 per cent of possession inside the opening quarter of an hour, Roma took the lead when Pellegrini latched onto Nicola Zalewski's throughball before drilling through the legs of Kasper Schmeichel.

The Foxes, who lost Castagne to injury soon after, looked to respond. Chris Smalling made an important block to deny Lookman, who also stung the palms of Rui Patricio from 20 yards.

Lookman then squandered a decent opportunity to equalise early in the second half; heading Marc Albrighton's corner over from inside the six-yard box.

But Brendan Rodgers' side not to be denied in the 67th minute as, under pressure from Lookman, Mancini turned into his own net from point-blank range after excellent work from Barnes.

The hosts pushed for the winner with Kelechi Iheanacho going close, but they had to settle for a stalemate.