I initially put in a vote for Wood, based largely on the white markings on the face. Examples in first picture below of adult, non-breeding Wood from Ebird and Shorebirds, an ID Guide by Hayman et al.
Edit: I hate to be wishy-washy, but I looked up Greenshank and Wood SP in a European field guide and noticed that Greenshank is often drawn with a rather uneven demarcation between the brown uppers and white lowers. I looked on-line and sure enough, it's a trait often captured in photographs. The bottom of the wing-line of the mystery bird definitely looks more Greenshank-like than Wood. I hope my attempt to help didn't further confuse.