Sunderland have been dealt a 'big blow' with the news that loanee Ellis Simms is returning to Everton as soon as the transfer window opens.

The Lowdown: Simms impresses for Sunderland

The 21-year-old joined the Black Cats during the summer transfer window and he has made a big impression during the first half of this season.

Simms has scored seven goals in 14 Championship starts, also registering two assists, with pundit Lee Hendrie describing him as 'brilliant' last month.

There have been strong rumours of the youngster returning to Everton, however, with Frank Lampard lacking options in his struggling squad.

The Latest: Everton return confirmed

Taking to Twitter on New Year's Eve, Hunter confirmed that Simms is heading back to Goodison Park, and the reporter was seemingly gutted by the news:

"It’s official. Big blow for #safc, Ellis Simms has been excellent in the first half of the season - despite his injury."

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The Verdict: Huge blow for Black Cats

There is no denying that this is a massive worry for the Black Cats, with Simms such an influential performer this season - only Ross Stwart has outscored him in the league, and he himself has been linked with an exit.

It has the potential to have a major impact on Tony Mowbray's side's promotion chances and it is imperative that they sign a tailor-made replacement in the January transfer window to make up for his exit.

Sunderland could find it tough to sign a loanee who has as much of an impact but it would be negligent not to bring in someone to fill the Simms-shaped void.