The first time he completed an entire game was in week 6 of the Clausura 2012 when they were defeated by Monterrey.
The tournament in which he managed to accumulate the most minutes was in the Clausura 2014, totaling 1,286 minutes with 16 caps.
He suffered from an injury in the start of the Clausura 2014 and on another in mid-season, this affected Guadalajara as they had 9 players injured midway through the Clausura 2014.
Aldo and Bravo sometimes yell, scold, they scold us the younger players, but it's humbly, don't talk back, if they are nagging at you it's for something, for you to improve, for you to grow, accept what they ask and be thankful for all the help the bigger names bring." From the beginning of Liga MX and Copa MX Apertura 2014, Fierro has been capped 12 times and scoring 3 goals which is the same amount of goals he scored in the 2013-14 season.
on 26 April City Ladies were announced to have been reassigned to the new first division of the WSL, replacing established team Doncaster Rovers Belles, who were downgraded to the second division and were the only team to lose their top division status.In anticipation of their first WSL season the club began a complete renovation of the playing squad, signing a number of England internationals and promising players, including the likes of England goalkeeper Karen Bardsley, Nick Cushing was appointed first team manager, with Leigh Wood moving to 1st team head coach.In August 2014, following the successful restructure of the Development Squad and Youth Section, Wood's contract was terminated by the club and latterly former assistant manager Kevin Sims also followed.Manchester City Ladies was formed in November 1988, playing their first match against Oldham on Boundary Park's artificial pitch.
City won the friendly 4–2 and joined the North West Women's Regional Football League the following season.
Fierro's brother Gustavo had left to Jalisco in 2007 to try his luck with C. Guadalajara, so in 2008, Fierro followed his footsteps to try to make it in Mexico's most beloved club.