"Revolt by senior leader like Jaswant Singh on denial of a ticket was unfair.
"There may be reasons for not giving him ticket. He should have avoided taking such step," Mathur told reporters.
Mathur, however, did not clear the air on whether Singh's suspension may be revoked.
Mathur, party's Gujarat in-charge, said that Singh's meeting with senior party leaders was his personal matter and it is the party high-command which decides who will be in the party and who will not.
Singh had met with senior party leader LK Advani on Saturday.
He had contested the Lok Sabha election from Barmer as an independent candidate and lost to BJP's candidate Colonel Sona Ram.
He was expelled from the party following his revolt.