Sanchez signed Lee Cook on a four-year deal from QPR on Thursday and has splashed out around £20million on seven new players this summer.
Sanchez said: “I am pleased to have added Lee to our summer signings and am confident that he has the ability to play at this level.
“I know that he is hungry and ambitious and will do everything he can to impress in this league.
“Lee’s addition gives us much needed left sided options.
“I am now approaching the first game of our season, confident that we have a squad of players that will do well.”