I think Pep was out of work , taking a sabbatical IIRCI dunno. Pep was announced as our next manager at the start of February 2016 when he still had several months of his Bayern contract to run so Haaland's next club could be announced sooner than March (that's assuming he's decided which club he's going to of course). I would expect him to first tell Dortmund of his intention to leave though, but he might've already done that. Dortmund aren't daft - they'll know that Haaland would've been speaking to potential suitors for months.