In January, Inter midfielder Fredy Guarin appeared to be one of European football's hottest properties but last night he made a shocking error which cost the struggling Nerazzurri another two points.
Guarin's future was the subject of intense speculation in the winter transfer window with a number of top sides including Chelsea, Manchester United and Tottenham tipped to swoop for him.
In the end, the Colombian international came within hours of joining Juventus but a deal fell through at the last minute.
Last night, however, Guarin didn't show the form that had attracted such interest and he rounded off a fairly anonymous evening in Livorno with a glaring mistake.
Inter were under pressure to deliver a win against the Tuscan strugglers and coach Walter Mazzarri knew there could be no excuses after a home 0-0 draw against Udinese that saw the Milanese giants denied by inspired goalkeeping and harsh refereeing.
Everything seemed to be going according to plan when Inter went 2-0 up courtesy of Brazilian midfielder Hernanes and Rodrigo Palacio.
But Livorno staged an incredible comeback after the break, initially reducing the deficit when ex-Fulham target Paulinho fired home after a corner.
And in the dying stages, Guarin made the baffling decision to try and pass back to Inter goalkeeper Samir Handanovic from near the halfway line.
The ball was intercepted by Innocent Emeghara who went through on goal and converted to the clear dismay of Guarin and coach Mazzarri.
The result was an unexpected boost in Livorno's relegation battle and another big blow for Mazzarri and Inter.