When Singletary decided to make a change less than 24 hours later and fired offensive coordinator Jimmy Raye, Johnson was ready.
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"It's something that I've thought about for a long time," Johnson said Thursday, formally speaking for the first time since being promoted to replace Raye. "It's something I just didn't come up with that night. He didn't tell me anything the night before, and I didn't ask why. I went back home and put it together and brought it to him in the morning."
Singletary initially said after Sunday's loss at Kansas City that he was keeping Raye. After returning to the 49ers' facilities later that night, the coach watched several game films and changed his mind.
The 180-degree turnaround came as a shock to some because of the timing and Singletary's supposed support for Raye, though many in San Francisco's locker room welcomed the change.
"Mike might bring something different to the table with the passing and the running game, and try to mix it up," tight end Delanie Walker said. "I'm just looking forward to seeing what we're going to do."
Johnson, who had previous NFL coaching stops in San Diego, Atlanta and Baltimore before joining Singletary's staff before the 2009 season, said he won't make radical changes to San Francisco's offense. With a little tweaking of the playbook, Johnson believes the 49ers have enough talent on their roster to be contenders.
That might not sit well with frustrated San Francisco fans hoping for major renovations. The winless 49ers went into the season with playoff aspirations, but now they're trying to prevent starting 0-4 for the first time since 2005.
"You have a certain way we've been operating for the last 1½ years and you can't go in in one week and change the entire playbook," Johnson said. "There will be some different things, but I don't think we'll make a bunch of wholesale changes. We're going to take the same core plays, the same core concepts and make them look a little different to the opponent and then see if we can have a different result."
Singletary, who doesn't talk to the media on Thursdays, insists his own philosophy for San Francisco's offense remains the same: a physical, balanced attack with an emphasis on the ground game.
"Coach Singletary has a philosophy and he has a certain core of principles he wants to operate from," Johnson said. "But he has given me the freedom to do certain things within that philosophy to win football games. I believe that you have to be multiple and be diversified.
Raye discusses firing
"Jimmy Raye left a great foundation here. What I'm going to try to do is to get the ball to the players on our offense that can make plays, to utilize the talent and potential that we have here as an offense."
Smith has passed for 732 yards and two touchdowns with five interceptions, and his 66.2 rating is 28th among the league's 32 teams.
"Alex has played OK," Johnson said. "He has not played great, and that's why I think our offense has not played to that level. In saying that, we have to give him a better opportunity as coaches to make sure that he is successful. That's what I'm going to try to do with the entire offensive staff."
Copyright 2010 by The Associated Press