Terry has rejected a surprise move to Spartak Moscow for family reasons after leaving Aston Villa following a single season with the Championship club.
Sarri believes Terry, 37, still wants to play for another season, but insists he will always be welcome at his "home" back at Chelsea.
"The last time I have spoken with him, he told me that he wants to play for another season".
"I don't know now the situation".
"I will be speaking to somebody at Chelsea about one or two things", Warnock said.
Mark Lawrenson is tipping Chelsea FC to claim a 3-0 win over Cardiff City in their Premier League clash at Stamford Bridge on Saturday afternoon. Chelsea coach Maurizio Sarri has instated a revolutionising gameplay at his side which is reaping overwhelming rewards from it.
"At the moment, in my opinion, Liverpool and Man city are better than us".
'I am very open with him because he is the history of the club. For sure, he would be a point of reference for me.
In his pre-match press conference, Sarri had stated that the league title might be out of grasp of his side this season and he reiterated those thoughts in the post-match presser as well. If he wants to play for another season I think it's right he tries to play.
"Manchester City and Liverpool are another step up to us but I think we can improve".
John Terry spent last season playing for Steve Bruce at Aston Villa, and, amid rumours that the Birmingham club would happily welcome the former England captain back into the fold, Terry must now decide whether he is ready to call time on his playing career for the goal of rejoining Chelsea. "I think this season is too soon, but I hope not", he said.
'When Alvaro is playing it is completely different he is a different type of player both are quality so we are happy to have good strikers'.