The San Francisco 49ers have to be thrilled with what they got from Raheem Mostert last season.

Mostert entered the year as their third-string running back. He ended up being the best of a trio that caused a lot of problems for opposing defenses.

The running back racked up an impressive 772 yards and eight rushing touchdowns on just 137 carries, averaging 5.6 yards per carry. He also added 14 receptions for 180 yards and another two touchdowns in the air.

Those marks were all career-highs for Mostert. And due to that, it's safe to assume the 49ers have some big plans for the running back in 2020.

However, it's always smart to have a backup plan. In fact, last year proved to San Francisco that having a few good running backs could help carry an entire offense.

With that in mind, the 49ers chose to stick with Jerick McKinnon this offseason. And according to Scott Bair of NBCSports.com, Mostert is very excited about what his now-healthy teammate could bring to the offense. Said Mostert,

“I’m definitely excited … I have been keeping up with him even last year and helping him out throughout the season and giving him pointers here and there. He has always been one to learn. That’s what I appreciate about him, especially coming into this offense. He’s definitely more so the pass catcher but he’s always trying to elevate his game.

“He’s going a great job with his workouts … We always talk about it, and he’s helping me, too, understanding more of the playbook. He has had more time understanding it than I have route running-wise. I’m trying to pick his brain and he’s trying to pick my brain with the run scheme.

“We’re doing a great job right now. I can’t wait for him to show what everyone has been doubting him on and missing out. I’m excited, man. It’s going to be a surprise for everyone.”

McKinnon has not played since 2017 because of an ACL injury he suffered in 2018. However, he was a very dangerous weapon during his four years with the Minnesota Vikings. Now that he's ready to go again, he could be a great addition for the 49ers offense, and Mostert knows it.

Mostert had some very positive words about the running back. That included praising his ability to learn and the work he's put in to improve his game.

This could be a very dangerous duo in the backfield, especially with McKinnon's ability to catch passes, adding an extra dimension to the Niners offense.

It should be fun to watch what the duo of Mostert and McKinnon can do in 2020 — except, perhaps, for opposing defenses.