The former Real Madrid man says the San Siro side must now put all their effort into improving their Serie A form if they are to qualify for Europe this seasonKaka has acknowledged that AC Milan are in danger of missing out on European football next term after Wednesday's Coppa Italia defeat to Udinese.
The Rossoneri crashed out after a 2-1 home reverse in the quarter-final and the Brazilian midfielder realises Milan have plenty of work to do if they are to achieve anything in 2013-14.
"It's tough for all of us at the moment. We have a lot of improving to do. It's a tough moment and it's bad to get knocked out of the cup at home," Kaka told the official Milan website.
"There's a chance now that we won't be playing in Europe next season but we should take this as a motivation. It's hard to imagine a Milan side that does'’t play in Europe.
"We're really disappointed. The cup was the best way to get into Europe next season and now we have a tough road ahead of us in the league.
"We have little to talk about and lots to work on."
Milan resume Serie A action on Sunday when they travel to Cagliari. They currently sit 11th in the table with 25 points from 20 games.