Sutton told BBC Lincolnshire: "We want to get a proven striker with a good pedigree but everyone wants a good striker and it's proving difficult.
"We might have to utilise the loan market again but we are trying to find someone on a permanent basis."
Since the end of the season, Lincoln have signed goalkeeper Joe Anyon, midfielder Josh O'Keefe and winger Mustapha Carayol, but Sutton has yet to add a striker to the ranks at Sincil Bank.
Source: BBC Sport
Source: BBC Sport