"The Slovakia and Slovenia games will be very good preparation for the vital World Cup qualifiers against Ukraine and Croatia," he added.
The two friendly opponents are in the same Group three World Cup qualifying group, with Slovenia winning 2-1 on 10 September, to go joint top alongside Poland.
Meanwhile, England's fellow Group six opponents, Kazakhstan have sacked their manager Arno Pijpers following a disappointing start to their campaign.
Kazakhstan, who will play England at Wembley on 11 October, began with a 3-0 victory over Andorra, but have since lost 3-0 at Croatia and 3-0 at home to Ukraine.
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