Frank Lampard will not celebrate if he scores against Chelsea for a second time this season, according to his father.
Lampard, 36, is Chelsea's 211-goal record scorer -- and he opened his Manchester City account with the equaliser in a 1-1 draw between the two sides in September.
The veteran midfielder did not celebrate that goal and his father and namesake, a former West Ham and England left-back, said he and his son, who remain Chelsea season ticket-holders, won't celebrate if he scores again on Saturday.
"He'll approach it as a proper professional," Frank Lampard Sr. told the Daily Mail. "If he does score, he won't celebrate. He has too much respect for Chelsea, especially the fans. Me too.
"And I'll be among friendly faces in my usual seat, like I was on Tuesday when I went to see them beat Liverpool. Don't forget, me and Frank have kept our season tickets at the Bridge."
Lampard Sr. defended his son's decision to join City after leaving Chelsea by arguing that, after 13 years at Stamford Bridge, he did not have the option to stay and this was his last chance to compete at the top level.
He added: "He had not been offered a contract by Chelsea. So he would have to leave. There were no gripes from his side.
"This happens in football. All good things come to an end. Especially at a great club like Chelsea, the time comes when they want to move on. He accepted that and decided he would like to broaden his horizons by playing abroad.
"So he signed for New York City, not Manchester City. When that was happening last summer, Man City went to New York on tour and Manuel Pellegrini came to see Frank. He asked if he would like to join them until the end of the year as a way of keeping fit while waiting for the start of the season in America this March.
"What was he supposed to do? Suddenly the champions of England are asking you to join their squad for a bit so you can stay in shape.
"In any walk of business, if a company lets you go and someone else offers you the chance to work for them at the same high level, what do you say?
"Frank spoke to me about it and I said to him that he would never get another chance of Premier League and Champions League football. I said to him: 'You are a professional footballer. That's your job.' Our family has been brought up in football. It was all I knew."
Meanwhile, former Chelsea owner Ken Bates has said he believes Lampard, who joined from West Ham in 2001, is the best buy the club have ever made.
He told The Sun: "I did a deal at nine million pounds. By the time it was all completed it had risen to 11 million pounds. Don't ask me why... but it's still the best 11 million pounds Chelsea have ever spent.
"Frank was special, and not just as a player. He brought an intelligence to football that we have rarely seen."