Mourinho has been heavily linked with a move to Manchester United following his departure from Chelsea, with Louis van Gaal under increasing pressure after defeats to Sunderland and Midtjylland.
Neymar has also reportedly been targeted by the Red Devils, with his current Barcelona deal due to expire in June 2018 and negotiations over an extension currently continuing.
Guardiola, meanwhile, will be in the Premier League next season after confirming his move from Bayern Munich to Manchester City this summer and Neymar says he takes great interest in both of their careers.
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"I admire them both, I've been following both of their paths for some time," he told A Bola.
"But my coach is Luis Enrique and I defend Barcelona."
Mourinho has recently admitted he is not sure where his next club will be claiming he is not looking for a club but "clubs are looking for me".