Bolton Wanderers have confirmed that Stuart Holden is set to be sidelined for up to nine months.

The 28-year old midfielder, who has played 25 times for the USA national team, sustained yet another knee injury when attempting to make a comeback for the Trotters' U21s last week.

Holden had been out since last summer after tearing his anterior cruciate ligament in his right knee while representing America at the CONCACAF Gold Cup and was hoping to get through a full reserves outing with Bolton.

However, he went to ground in a tackle and was left clutching his knee before limping off less than 30 minutes into the match against Everton's U21s.

Bolton have now confirmed that the former Houston Dynamo star has undergone surgery on the problem area and will now be out of action at least until the end of the year.

Bolton posted the following on Twitter:

.@stuholden will be out of action for between six and nine months following an operation on the ligaments in his right knee. #BWFC — Bolton Wanderers FC (@OfficialBWFC) March 11, 2014

Holden also offered this on the social networking site:

Requested yesterday that I have my surgery done with my warrior hat on. #noholdenbackpic.twitter.com/O7jBbMcLpL — Stuart Holden (@stuholden) March 11, 2014

After revealing some news about his relationship with Project Runway model Karalyn West.

In better news excited to spend the rest of my life with you! @KaralynWestpic.twitter.com/3sYJjth8AL — Stuart Holden (@stuholden) March 11, 2014

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