Curbishley who has been out of management since leaving West Ham in 2008 was in charge of the Addicks in two spells between 1984-87 and 1990-93.
And asked what the hardest sale of his managerial career had been at an event run by Budweiser he told players of non-league Dorking it was the transfer of midfielder Parker a firm favourite at The Valley in 2004.
Curnishley said: ‘Definitely the Parker deal because we were fourth in the Premier League we beat Chelsea 4-1 at The Valley and the next week Chelsea made a bid for him and it was impossible to keep him.
‘And I couldn’t spend the money [Parker cost Chelsea £10million] because we had three or four days before the window closed. We finished seventh and I think we’d have finished in the top five [if we'd not sold Parker] because of the squad we had.’