Perhaps he got a little unprofessional with his diet during lockdown; and we don't want publicity photos of a chubster?
Apparently the club asked Hojbjerg - as a final favour - to fly the aeroplane that Salisu would be coming over in. Hojbjerg gladly accepted, but whilst trying to land the plane on the runway at Southampton Airport, he in fact ended up bringing it down somewhere on Titan Mimus, one of the moons of Saturn.