Butler, who was making his weeky appearance during a program originally aired on the Steelers' official website, made a mistake when asked about Eifert as the Steelers (8-6-1) prepare to face the Bengals (6-9) on Sunday.
The Steelers' coach was asked where Eifert ranks among NFL tight ends during an episode of "Coordinator's Corner." He answered, but mistakenly said Eifert would be a challenge to cover this weekend.
Eifert hasn't played since Week 4 of this season after suffering a gruesome injury in September. He was placed on injured reserve shortly afterward on Oct. 5.
"I think he's very good," Butler said about Eifert in the since-deleted interview. "I think he's up there. He can get deep on you. He does a good job of catching the ball downfield, all that stuff. So, he's going to be a problem for us to cover."
Eifert saw Butler's comments and took to social media to joke about the coordinator's comments.
"Hey I am ahead of schedule!" Eifert wrote on Twitter. "Glad the @Steelers are still thinking about me tho."
Eifert tallied 15 catches for 179 yards and one touchdown before sustaining a significant ankle injury against the Atlanta Falcons on Sept. 30. He has 142 receptions, 1,716 yards and 21 touchdowns since entering the league in 2013, and was a Pro Bowler in 2015.
C.J. Uzomah replaced Eifert and fellow tight end Tyler Kroft in the starting lineup after their respective injuries.