Negotiations are said to be at an advanced stage, with the 22-year-old centre-back keen on a move to England.
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Frankfurt are reportedly willing to part ways with the Swiss defender if an agreement can be reached.
Strengthening the heart of defence has been a priority for Coventry during the transfer window, alongside the search for a left-back and new wide players.
The Sky Blues are also looking to reinforce their goalkeeping department, with Brighton's Carl Rushworth remaining their preferred target after impressing during his loan spell at the CBS Arena last season.