By Jamie Spencer Barcelona are reported to be weighing up striker options to eventually replace Robert Lewandowski, although their early shortlist features at least one very unrealistic target. Lewandowski recently celebrated his 36th birthday. But while the veteran Pole has started the new season in good form, scoring four times in his first five La Liga appearances, the club cannot ignore the fact that he is now well into the latter stages of his career. Barca spent big money on Vitor Roque until deciding pretty quickly that the young Brazilian was not what they wanted. In the summer, he was…