I watched Leipzig regularly because I follow Tyler Adams (besides Bayern's future coach Julian Nagelsmann) and I did not even know that this player existed. So, he wasn't playing in the Champions League regardless.
At the same time it makes sense that Chelsea is recalling him for another loan since he barely saw the field during this loan spell. Maybe the next loan will keep him in England, at 19 a midtable Championship team is a better option to earn minutes.
A disaster will be if Schick returns early to Roma though. Without Werner and with Poulsen coming back from injury the in form Czech CF is almost a must.