David Johnson

Johnson was an All-Pro in 2016 after accruing 2,118 all-purpose yards and, despite missing 15 of the 16 games the next season, he was given a three-year $39million deal on the eve of the 2018 season.

However, Johnson has failed to live up to that contract since, rushing for just 1,285 yards combined across the past two campaigns and losing his starting spot to Kenyan Drake last season when the Cards acquired him in a trade with the Miami Dolphins.

Arizona want to keep Drake, who is due to enter free agency, but Johnson is owed a guaranteed $10m in 2020 and has a salary cap hit of more than $14m, so Keim acknowledged it does not make financial sense to move on from the 28-year-old.

"Cutting him is not an option," Keim told Arizona Sports 98.7 FM.

"Not only the cap hit, but you're still paying him the cash as well, and it wouldn't be responsible for me or the organisation for me to do that.

"If David Johnson isn't the starter, he still has a significant role. He still creates big-time mismatches in the passing game, he still brings kick-return ability.

"There are a number of things, and you can't just have one back. You have to have a platoon of backs. We've seen that. So there are enough carries to go around."

Johnson was drafted by Keim in the third round of the 2015 NFL Draft after Arizona missed out on their preferred target Ameer Abdullah to the Detroit Lions.

It looked like a stroke of good fortune after two seasons and Keim is hopeful Johnson can still deliver on the gridiron, though he would not discuss the possibility of a trade.

"I still have a lot of faith in David," Keim added.

"He's got tremendous skills, he's a great person, he works extremely hard.

"I think it was one of those things [last season], if you look at the big picture, Chase [Edmonds] got hurt, David got hurt, we made the trade [for Drake], and Kenyan Drake came in and he got the hot hand."

Wide receiver Cobb has agreed a three-year, $27million deal with Houston that contains $18.75m in guarantees, according to NFL Network.

The move came after star wideout Hopkins was stunningly sent to the Cardinals in a package that saw running back David Johnson move in the other direction.

Houston also netted a second-round draft pick this year and a fourth-rounder next year, while sending away their 2020 fourth-round selection.

Four-time All-Pro Hopkins later tweeted to say the city of Houston will "forever be loved" and stated his new goal was to bring a championship to Arizona.

As well as adding Cobb and Johnson, the Texans have re-signed cornerback Bradley Roby, tight end Darren Fells, quarterback AJ McCarron and kicker Ka'imi Fairbairn.

Cobb, 29, spent last season with the Dallas Cowboys and caught 55 passes for 828 yards before hitting free agency.

The slot receiver had spent the first eight years of his career with the Green Bay Packers, striking up an impressive connection with QB Aaron Rodgers.

According to ESPN's Adam Schefter, the Texans will also receive a second-round pick in April's draft and a fourth-round pick for 2021.

Running back Johnson appeared to confirm the move with a post on Twitter.

He wrote: "LET'S GO HOUSTON!!! See you soon."

Wide receiver Hopkins recorded his third successive 1,000-yard season in 2019 but has been sacrificed after tailbacks Carlos Hyde and Lamar Miller entered free agency.

Johnson endured a disappointing season last year, with 370 receiving yards in addition to 345 on the ground. He finished with six total touchdowns.

The Cardinals moved to ensure they are not left short in the running back position by placing the transition tag on Kenyan Drake on Monday, meaning they can match any offer he receives in free agency.