Roma, Paris Saint-Germain, Ajax, Bayern Munich and Wolverhampton Wanderers have also been linked with the attacker.
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros winner.
Baum faces a big challenge at Schalke, who are on a run of 18 winless games since January 2020. The new Bundesliga season began with a heavy 8-0 defeat to Bayern Munich, followed by an uninspiring 3-1 loss to Werder Bremen, leaving Schalke with zero points and in last place in the table.
The 12-time champion also improved his record at Roland Garros to 95-2 with this win.
Evergrande had secured the top place of Group A before Sunday's match, while Dalian had dropped into the Final B.
The former amateur midfielder proved its qualities when it comes to long-term development measures when leading the TSG Hoffenheim and RB Leipzig from the lower leagues to the Bundesliga. A similar supervising position seems an option at Schalke.
Eriksson led Alba scorers with 18 points. Fontecchio finished with 16 points and 8 rebounds.
New arrival Nayef Aguerd's goal after 33 minutes put Rennes in front. Serhou Guirassy scored a brilliant volley set up by winger Romain Del Castillo in the 52nd minute to extend Rennes' lead, before Adrien Hunou added the third in the closing period with a superb lob.
Mendilibar lost several key players, such as Fabio Orellana, Charles and Escalante over the summer, while Ivan Ramis retired, and so far adequate replacements haven't arrived leaving the squad weaker than the one which struggled last season.
The competition's group stage draw will take place on Friday, in the Swiss city of Nyon. Enditem
To do the job, the 50-year-old needs the entire club's support and the majority of the passionate supporters. The fans are said to play a vital role as Schalke is thinking about new investors connected with outsourcing the professional section. Enditem