The Holland defender is a target for Newcastle and AC Milan.
"We were already asked for Sven last summer, but we were clear - we need him for this season," Letang told MilanNews.
“We are making a move also in the Champions League, where we qualified for the second round as top of the group.
“There are some important goals for this second part of the year, so Botman will stay with us to pursue them until the end of the season."
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