The 32-year-old defender made back-to-back appearances for the first time since February by featuring in Sunday's 2-0 defeat of Swansea which saw Chelsea consolidate their position in the Premier League top four.
Terry has hinted at a possible England return but Benitez declined to comment on the prospect of the skipper coming out of international retirement which was prompted by his Football Association charge and subsequent ban for racially abusing QPR's Anton Ferdinand.
"That is not my business," said Benitez. "My business is to keep him as fit as possible for every game.
"I only speak to him about Chelsea."
Another of Chelsea's old guard, Frank Lampard, attracted praise following the victory after netting his 201st Chelsea goal.
After setting up Oscar's opener, Lampard, who began the game as a substitute, converted a 45th-minute penalty to move within one of the club record held by the watching Bobby Tambling.
The midfielder is 35 in June, out of contract this summer and his future remains uncertain.
"Frank is a great player," added Benitez.
"I'm really pleased he's scored another goal and hopefully he can score five between now and the end of the season and he'll be much happier and we will be the same."