The 20-year-old Spaniard has been one of the Eagles' most consistent performers this season, belying his tender age with a string of impressive performances at the heart of their defence. Only three teams boast a better defensive record than Frankfurt (33 goals conceded), and they just happen to be the top three in the Bundesliga: Bayern Munich (15), RB Leipzig (30) and Hoffenheim (31).
"The news is a real set-back for us heading into a very important part of the season," admitted Frankfurt's sporting director, Bruno Hübner. "Jesus is an important member of the team and a major force in our defence. He will be tough to replace, but I still have faith in the squad. We wish him a full and speedy recovery, and hope to see him in an Eintracht shirt again."
Vallejo joined Frankfurt on a season-long loan from Real Madrid last summer, and has played 25 games in all competitions in 2016/17. The Eagles are currently 10th in the Bundesliga table, just three points off sixth place and a spot in the UEFA Europa League. They also take on Borussia Mönchengladbach next week for a place in the DFB Cup final.