"Tevez is absolutely key to City's hopes, both in this match and for the rest of the season, " Rosler, who scored twice against United in the Manchester derby during a four-year spell at the club from 1994-98, told BBC Sport.
At his Senate hearing last month, General Hayden told Michigan Democrat Carl Levin not once but twice that he was not "comfortable" with intelligence-related work that had been done by an office reporting to former Undersecretary of Defense Doug Feith.