Kyle Shanahan will become the next head coach of the San Francisco 49ers.

Shanahan was not able to accept a contract offer from the 49ers until after the Falcons' postseason run concluded. 

Shanahan, 37, is expected to sign a six-year deal.

Shanahan was the playcaller behind the NFL's top scoring offense in 2016, as the Falcons averaged 33.8 points per game.

While Shanahan's offense got out to a 28-3 lead in the Super Bowl, his playcalling down the stretch of Atlanta's eventual loss was criticized.

"The thought is to get as many yards as you can,'' Shanahan said of not running while in field goal range. "And we were right there on the fringe. It was by no means an easy field goal. From what I remember, we ran in on first-and-10 and lost yards. Got into second-and-11, so we try to get a pass to get us back into a manageable third down, closer to the field goal, and we took a sack. Taking a sack ... got us into a third-and-20, so we threw a quick pass trying to get back into field goal range, which we did. But there was a holding call on the play. And when you get a holding call on third-and-20, it goes back that far. We were way out of field goal range. We tried our best to get back in but couldn't get it done.''

Shanahan was then asked about the fine line between being aggressive with the pass and being mindful of clock management.

"It's not really the run-pass ratio that I look at,'' Shanahan said. "It's you stay on the field, and you run your offense. When went three-and-out two times, which was huge. I think we had second-and-1 on both of those. To not convert on second-and-1 and then third, it was tough. That's why we let them get back into the game.''