Antonio Conte said Scudetto challengers Inter gifted two goals to Lazio and were "scared" in the second half of their 2-1 Serie A loss on Sunday.
Inter's half-time lead was erased as Ciro Immobile and Sergej Milinkovic-Savic completed a comeback for Lazio, who leapfrogged the Nerazzurri into second position.
Conte's side started the weekend ahead of defending champions Juventus on goal difference but by the end of their trip to Rome, Inter were three points off the pace in the race for the Scudetto.
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After the blockbuster showdown in the Italian capital, Inter head coach Conte told Sky Sport Italia: "I think it was a good performance, it's the result I didn't like and the way we conceded the two goals, as we gifted them to Lazio.