By Grey Whitebloom Liverpool backup goalkeeper Caoimhin Kelleher has expressed concerns about how his performances in the absence of Alisson over the coming weeks could complicate a potential sale. The long-serving number two openly wanted to leave Merseyside last summer in search of sustained first-team football. Kelleher has only been afforded opportunities in the Premier League when Alisson, the undisputed first choice, has been injured. The Brazilian shot-stopper pulled up with a hamstring injury ahead of October’s international break, ruling him out of as many as seven fixtures. Kelleher …