But Simpson, 19, impressed while on loan at Millwall last season, winning the League One player of the year award, and Gibbs, 19, spent three months with Championship side Norwich.
Hoyte, the younger brother of Middlesbrough's former Arsenal full-back Justin, is yet to have a spell away from Arsenal but the 18-year-old defender played 90 minutes in all three of the club's Carling Cup games.
The Mexican striker Carlos Vela, 19, has had spells with Osasuna and Salamanca, while the midfielder Fran Merida, 18, spent four months at Real Sociedad last season.
Midfielders Nacer Barazite, 18, and Armand Traore, 19, are currently on loan at Derby and Portsmouth respectively.
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