"His inability to regularly score goals meant that with Hooper & Samaras being preferred strikers, Samaras had to remould his game. Manager Neil Lennon moved his role to more of a winger on the left wing."
http://www.thecelticwiki.com/page/Samaras,+Georgios
Either way sounds like he has been playing poorly for the last couple of seasons and isn't as good as he was a few years back.
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Russia (4-3-3): Vyacheslav Malafeev; Aleksandr Anyukov, Aleksei Berezutski, Sergei Ignashevich, Yuri Zhirkov; Roman Shirokov, Igor Denisov, Konstantin Zyryanov; Alan Dzagoev, Aleksandr Kerzhakov, Andrei Arshavin.
Czech Republic: Petr Cech; Theodor Gebre Selassie, Tomas Sivok, Roman Hubnik, Michal Kadlec; Jaroslav Plasil, Petr Jiracek; Jan Rezek, Tomas Rosicky, Vaclav Pilar; Milan Baros.