Inter face Udinese away in Coppa Italia the 9th of January. If the nerazzurri would win the game at the same time as Milan wins their game against Spezia at the San Siro the 15th of January, a derby will be played shortly after. A possible Coppa Italia-derby could be played in the quarter final and if the both teams win their games the game would be played the 22nd of January.
Source: Fcinternews.it
