"Eight points is a big gap, but a comeback is possible given that the second half of the season has only just started.
"There are lots of games left and we won't be giving up - we will fight to the end."
With the Olympics looming in the summer, Juan was asked to comment on whether he could be one of Brazil's overage players in China.
"It's not that Roma that have harshly told me not to go," he said. "But I didn't get any holiday because of the Copa America and after the Olympics there are World Cup qualifiers to be played."