The Ravens have made a poor start to their defence of the Super Bowl crown that they won last season, with yesterday's 24-18 defeat to the Cleveland Browns leaving them third in the AFC North with a 3-5 record.
Harbaugh admits that his side now face an uphill struggle to reach the playoffs this campaign, but believes that his players are good enough to turn their season around.
"I think we have good players. I know our players are good enough to win these games. There's no doubt about it. We just have to play better," Harbaugh told The AP.
"It's going to be a challenge. We're 3-5. We've got our work cut out for us."
The Ravens will face the current AFC North leaders the Cincinnati Bengals on Sunday.