BankBoston, in an effort to participate more actively in the business of sports finance, yesterday announced a partnership in which it will invest and hold a minority interest in Boston-based sports consulting firm Game Plan LLC. Terms of the deal were not disclosed. Founded in '95 by attorney Robert Caporale and former Patriot Randy Vataha, Game Plan's clients include the All American Football League, for which it serves as a consultant. The company also recently assisted in the sale of 50% of the Penguins (Game Plan/BankBoston). In Boston, Tina Cassidy reports that BankBoston finances the Patriots, Stars and Eagles. However, Vice Chair Paul Hogan said that its lending portfolio is "relatively small," in the $100M range, and the bank "hopes to boost" that portfolio with the Game Plan venture. Caporale will leave his law partnership at Brown Rudnick Freed & Gesmer and will move Game Plan offices out of the firm and into space at BankBoston's headquarters. Game Plan will retain its name (BOSTON GLOBE, 12/18).