Zinedine Zidane's son Luca was among two Castilla players sent off as Real Madrid's youth side suffered another defeat on Sunday.
Lienhart, 20, has been a regular for Madrid's Castilla youth side since joining from Rapid Vienna in 2015.
Result means Castilla will remain in the third tier for a fourth consecutive year.
Zinedine Zidane's son Enzo Zidane stole the limelight for the wrong reasons after missing a penalty and being sent off for Real Madrid Castilla.
Ex-Castilla coach Luis Miguel Ramis has denied "attacking" current Real Madrid boss Zinedine Zidane in a tweet.
Martin Odegaard has struggled to impress with Real Madrid's reserves, and now a loan is in order for the Norwegian prodigy.
Real Madrid striker Sergio Diaz says he is not sure whether he will immediately join the first team squad or play for the club's Castilla youth team.
Ramis had been Madrid's Juvenil A coach and then stepped up to the Castilla job in January when Zinedine Zidane was promoted to first-team boss.
Real Madrid added Castilla players Mariano Diaz and Philipp Lienhart to their Champions League squad ahead of the knockout stage.
Former France international Zinedine Zidane says he wanted to become a coach in order to get out of his comfort zone.
Zinedine Zidane has cooled speculation he could replace Rafa Benitez as Real Madrid boss following the 4-0 home defeat to Barcelona at the weekend.
Real Madrid Castilla have signed Spanish goalkeeper Carlos Abad-Hernandez on loan from CD Tenerife for the next two seasons.
Real Madrid are set to do away with their C team, leaving an entire team's worth of promising young players without a club.
Rafa Benitez has been in touch with Real Madrid Castilla coach Zinedine Zidane to see which youngsters might join up with the seniors next year.
Zidane saw his young side collapse late this term to miss out on promotion to Spain's second tier in what was his maiden campaign in sole charge of a
Zinedine Zidane's Real Madrid Castilla team have failed in their bid to get promoted from Spain's third tier this season.
Odegaard, 16, trains with first-team stars during the week and only joins Zinedine Zidane's third-tier Castilla team for matches.
Zidane was last month banned from coaching for three months -- along with the man he assists, Santiago Sanchez -- after he was found to have taken the role without the necessary coaching qualifications.
Enzo Zidane, 19, came off the bench in the final minutes of the Segunda B clash against Conquense as Los Blancos recorded a 2-1 win.
The World Cup, Champions League and Ballon d'Or winner was banned for coaching Real Madrird's B side Castilla without the required UEFA Pro Licence.
Real Madrid say they are in "absolute disagreement" with the suspension handed out to Zinedine Zidane for supposedly coaching their B team without the necessary qualifications.
The former France international could face a ban as he has yet to complete the UEFA Pro Licence required by the Spanish authorities.
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