| Personal information | |||
|---|---|---|---|
| Full name | Seamus Anthony Brennan | ||
| Date of birth | 6 May 1937 | ||
| Place of birth | Manchester, England | ||
| Date of death | 9 June 2000 (aged 63) | ||
| Place of death | Tramore, Ireland | ||
| Position(s) | Full-back | ||
| Youth career | |||
| 1953–1957 | Manchester United | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 1957–1970 | Manchester United | 355 | (6) |
| 1970–1974 | Waterford | 40 | (0) |
| Total | 395 | (6) | |
| International career | |||
| 1965–1970 | Republic of Ireland | 19 | (0) |
| 1970 | League of Ireland XI | 1 | (0) |
| *Club domestic league appearances and goals | |||
Seamus Anthony "Shay" Brennan (6 May 1937 – 9 June 2000) was an Irish footballer who played as a full-back for Manchester United and the Republic of Ireland national team.