Iniesta's shirt said:
Spanish: "Dani Jarque siempre con nosotros."
English: "Dani Jarque you're always with us."
The Espanyol defender died in August 2009 of a heart attack.
From the BBC:
Espanyol captain Daniel Jarque has died after he suffered a cardiac arrest following a training session, the club have confirmed in a statement.
The 26-year-old midfielder had been training in Coverciano, Italy, where the squad are on a pre-season camp.