Japanese Olympic striker Yuki Otsu appears bound for Celtic after the Scottish giants made an offer to German side Borussia Moenchengladbach, a Japanese sports daily reported on Friday. The 22-year-old forward was the scorer when Japan pulled off one of the greatest upsets in Olympic football history last month, stunning reigning world and European champions Spain 1-0 in Glasgow. Celtic were so impressed with the youngster’s performance that they put in a bid for him, with a formal transfer agreement expected to be announced within a few days, the online edition of Sports Nippon reported. “We have been negotiating after receiving an offer from Celtic. When we settle the terms, his transfer will be fixed,” Sports Nippon quoted a person close to Otsu as saying. The deadline for a transfer in Europe is the end of August. Otsu, who scored three goals in six Olympics games, has struggled for playing time at Borussia where he played only three matches as a substitute and did not score.