Because they are Scottish not English.
Celtic won the Scottish League Cup in 1971.
Celtic, Rangers, Hearts, Dumbarton & St. Mirren
Rangers have won 53 league titles in Scotland, followed by Celtic with 42.
Celtic and Rangers are both good but usually in the Scottish league Celtic do better than Rangers but Rangers occasionally come out on top.
Both Celtic and Glasgow Rangers play in the Scottish league.
The Scottish Premier League (SPL) did not begin until 1998. Up until 1998 the Scottish Championship was called the Scottish Football League Premier Division, this was won by Rangers in 1996-97 and Celtic in 1997-98.
In all, Celtic have won the Scottish League Championship 51 times, the Scottish Cup a record 40 times, the Scottish League Cup 19 times and the European Cup once. Celtic have won 51 top-flight titles, and hold the record for most Scottish Cup wins with 40. The club's record appearance maker is Billy McNeill, who made 822 appearances between 1957 and 1975. Jimmy McGrory is the club's record goalscorer, scoring 522 goals during his Celtic career. Celtic Football Club are a Scottish professional association football club based in Glasgow. They have played at their home ground, Celtic Park, since 1892. Celtic were founding members of the Scottish Football League in 1890, and the Scottish Premier League in 1998 as well as the Scottish Professional Football League in 2013.
No they have their own league called the Scottish league. the main clubs are Celtic and clasgow Rangers.
Berwick Rangers is the English football team that plays in the Scottish League.
Glasgow Rangers won the Scottish Premier League in 1997.
Rangers Football Club