TOKYO, June 25 (Reuters) - Japan's Nikkei share average is expected to open higher on Monday, tracking gains in Wall Street and as exporters benefit from a softening in the yen on the back of improving funding for European banks. The Nikkei was likely to trade between 8,750 and 8,900, strategists said, after Nikkei futures in Chicago closed at 8,830 on Friday, up 0.6 percent from the Osaka close. "Trading will likely be rangebound today, though a weaker yen will give the market some supp