Assuming being on the bench as an unused sub counts as being 'fielded, he is not cup-tied for the Champions League;
http://www.uefa.com/MultimediaFiles/Download/Regulations/uefaorg/Regulations/02/35/87/89/2358789_DOWNLOAD.pdf
( see article 44 )
If he was not 'fielded', as he stayed on the bench, then he is also eligible for the Europa League knock-out stages.
( Unless I am reading the UEFA regs completely wrong ).