Foran made the observation following Inverness’s 3-0 defeat to Celtic away from home at Celtic Park.
After a goalless first half, Scott Sinclair put the Glasgow giants in the lead in the third minute of the second period.
Leigh Griffiths added the second on 63 minutes, and Tom Rogic wrapped up the scoring seven minutes from full time.
"We didn't lose the game today," Foran told BBC sport (17:10). "We lost it last week when we started thinking about playing here.
"Celtic Park used to have that fear factor and Brendan Rodgers seemed to have got that again, because we played with fear today.
"This game was lost before it started. We have been on a good run, but a few of them didn't believe in themselves today.
"If you haven't got belief in football, you're in trouble. Celtic are a fantastic side. They outplayed us.”
Rodgers was appointed the Celtic manager in the summer, and the former Liverpool and Swansea City boss has done a remarkable job at Celtic Park so far.
The Bhoys are going strong in the Scottish Premiership and should be able to win the title with relative ease.
Foran’s comments highlight just how important Rodgers has been for Celtic, as under Ronny Deila last season, things were far from great.
Celtic are at the top of the Scottish Premiership table at the moment with 31 points from 11 matches, 10 points clear of second-placed Aberdeen with a game in hand.