Goals from Rudi Skacel and Ryan Stevenson allowed the Edinburgh club to remain fourth on the table and according to Locke, it was the words of Romanov who took the talk instead of manager Paulo Sergio, that inspired the Jambos.
"He (Romanov] told them that they had to be on their toes because if not 'then Celtic would run all over the top of you'," Locke said yesterday.
"As I said, they certainly applied themselves brilliantly today."
Romanov's visit to the dressing room for the pre-match certainly made a difference with David Templeton admitting so.
"He has a few words and tells us to go out and have a good performance, and he also tells us to be on our toes because Celtic come here and play well - and last time they played really well against us here," he said. "So we had to try to put in a better performance and I think it showed.
"He comes into the meeting room before kick-off and has a few words to try and encourage us," Templeton added. "I think it worked today."