The 30-year-old, who plays for the Seattle Sounders in the MLS, spent five and a half seasons at Craven Cottage in his first spell after signing in January 2007 from New England Revolution.

During his first stay, Dempsey scored 60 goals in 225 appearances.

Dempsey scored the only goal of the match against Liverpool at Craven Cottage in May 2007 which secured Premier League football the following season.

Fulham will need all of Dempsey's experience with the London side sitting second bottom in the Premier League.

"It feels good to be back. This has always felt like my home in Europe," said Dempsey.

"I am excited to be back and be a part of this team and play in this league."

Dempsey said he also hopes that a spell in England will help sharpen his form ahead of the World Cup.

"I just wanted to be back playing at the highest level, get back to top form and get back to helping the team where they are not where they want to be in the table," he added.

"Going into World Cup year you want to get to that top form and carry that forward, so hopefully have a good showing."