Terry headed the fourth goal in a 4-0 win as Chelsea reached the fifth round of the FA Cup.
A report today claimed Terry and Benitez clashed earlier this month, but the captain branded it "rubbish" and said the two were on good terms.
"It was good to get on the scoresheet and good to be back," he told ITV.
"The manager knows me and I want to play. I have been out for two or three months (with a knee injury), but the other two (centre-backs) have been doing well.
"It's good to have competition."
Terry admitted that Chelsea found it tough to break down Brentford, with all four goals coming in the second half.
"They made it very difficult," he added. "(They had) two banks of four and sat very deep."