Gen 49:
1Then Jacob called for his sons and said, “Gather around so that I can tell you what will happen to you in the days to come:
2Come together and listen, O sons of Jacob;
listen to your father Israel.
3Reuben, you are my firstborn, my might,......
5Simeon and Levi are brothers;......
8Judah,
b your brothers shall praise you.....
13Zebulun shall dwell by the seashore........
14Issachar is a strong donkey,......
16Dan shall provide justice for his people
f.....
19Gad
g will be attacked by raiders,.....
20Asher’s food will be rich;.....
21Naphtali is a doe set free......
22Joseph is a fruitful vine,.....
27Benjamin is a ravenous wolf;......
28These are the tribes of Israel, twelve in all, and this was what their father said to them. He blessed them, and he blessed each one with a suitable blessing.
Does this mean there can not be any other tribe? Nope, it doesn't.