Brandon Brennan (English Wikipedia)

"Minor League Free Agents 2018". baseballamerica.com. November 6, 2018. Retrieved May 20, 2024.
Hilburn-Trenkle, Chris (March 24, 2022). "Minor League Transactions: March 9-23, 2022". Baseball America. Retrieved May 27, 2022.

cpblstats.com

"Fubon Guardians Release Brandon Brennan". cpblstats.com. July 26, 2024. Retrieved July 26, 2024.

"Blue Jays vs. Red Sox - Box Score". ESPN.com. June 12, 2021. Retrieved June 13, 2021.

Kroeger, Garrett (March 3, 2024). "Former Tecos pitcher signs with CPBL team". Laredo Morning Times. Retrieved October 29, 2024.

"White Sox add Brandon Brennan to 40-man roster". MLB.com. November 20, 2015. Retrieved December 14, 2018.
Johns, Greg (April 10, 2019). "Rule 5 pick Brandon Brennan enjoys success | Seattle Mariners". Mlb.com. Retrieved April 21, 2019.
"Mariners set 25-man Opening Day roster". mlb.com. March 19, 2019. Retrieved March 20, 2019.
"Mariners 5, Athletics 4 (Final Score)". MLB Gameday. March 21, 2019. Retrieved March 21, 2019.
"Transactions". MLB.com. June 16, 2021. Retrieved October 29, 2024.

"Outrighted: Smith, Centeno, Brennan". November 19, 2016.
"2018 Rule 5 Draft Results". MLB Trade Rumors. December 13, 2018. Retrieved December 14, 2018.
Byrne, Connor (April 28, 2021). "Mariners Claim Jacob Nottingham, Designate Brandon Brennan". MLB Trade Rumors. Retrieved October 29, 2024.
Polishuk, Mark (May 3, 2021). "Red Sox Claim Brandon Brennan From Mariners". mlbtraderumors.com. Retrieved May 3, 2021.
Franco, Anthony (September 14, 2021). "Red Sox Release Brandon Brennan". MLB Trade Rumors. Retrieved October 29, 2024.

"Pirate pair earn spots on MLB Rosters". Orange Coast College. March 28, 2019. Retrieved October 29, 2024.

"BRANDON BRENNAN Y TAYLOR COLE SE SUMAN A LA ROTACIÓN FRONTERIZA". tecolotes2laredos.com (in Spanish). July 14, 2022. Archived from the original on July 14, 2022. Retrieved July 17, 2022.

Brock, Corey (April 18, 2019). "How technology ID'd Brandon Brennan's secret weapon — and added it to the Mariners' bullpen". The Athletic. Archived from the original on October 29, 2024. Retrieved April 21, 2019.

"BRANDON BRENNAN Y TAYLOR COLE SE SUMAN A LA ROTACIÓN FRONTERIZA". tecolotes2laredos.com (in Spanish). July 14, 2022. Archived from the original on July 14, 2022. Retrieved July 17, 2022.