The Spain coach has offered his support to the Real Madrid goalkeeper and insists he remains la Roja's No.1 in his eyes
The Spain captain, who turns 32 today, was usurped as Madrid's first-choice keeper for the second half of the season, but Del Bosque believes the player most continue to keep his discipline as reports of dressing-room conflicts continue to surface from Santiago Bernabeu.
"If you asked me a tip for him, I'd tell him to do what he has done: be obedient, disciplined and discreet," the Spanish boss told reporters at the 'Football Draft 2013' event.
Del Bosque went on to assure Casillas that he would remain la Roja's skipper for the up-coming Confederations Cup in Brazi.
"He is our captain and we trust him," he added.
Real Madrid will hold a press conference for 20:00 CET on Monday as rumours of continued dressing-room disharmony, and the future of Jose Mourinho, continue to surface.