Coventry have completed the signings of Frank Nouble and Aaron Martin on free transfersStriker Nouble had been on loan at the Ricoh and after his release from Ipswich has signed a permanent deal until the end of the season. Defender Martin has inked an 18-month contract after leaving Yeovil and has made nine appearances for the Sky Blues while on loan. Nouble has scored four goals in 15 games and will be available to face Swindon in League One on Monday. Boss Steven Pressley told the club's official site: "We're delighted to get Frank signed up until the end of the season. During his time at the club, we believe he has shown that he has the potential to develop into a Coventry City player. "The deal is only until the end of the season and this is a pivotal period in Frank's career. He must show the supporters and myself during this period that he is worthy of a longer term deal." Pressley added: "We're delighted to be able to bring Aaron here on a permanent basis. "We tried to bring Aaron to the club two years ago and he is a player that I have tracked ever since. "He is a terrific professional with a real desire to improve and we believe that we can give him the confidence and platform to do so."