Coutinho has not played for the Reds this season as he has been unsettled by a failure to move to Barcelona.
The Catalans offered the Merseysiders in excess of £100m for the Brazil playmaker but they refused to do business as they wanted him to remain at Anfield.
There are sections of the media who have suggested the South American may not be in the right frame of mind to resume his Liverpool career.
But Moreno does not see it that way and hopes that his team-mate is at least on the bench for Wednesday’s Champions League opener against the Spanish outfit.
"I missed him,” Moreno told reporters. "He’s probably my best friend at the club so I was very happy to have him back. It was tough for him. He had a bad time but it’s over now and I know that he will give everything for Liverpool."