The former Villarreal and Hull City striker has refused to rule out a move to Wearside, though admitted he was content to stay at his current club for the foreseeable future
Goal exclusively revealed on Tuesday that the Black Cats had made a bid for the USA international, who scored 23 Eredivisie goals last season.
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"It would not be a problem for me to stay at Alkmaar because I am having a good time here and I have had two good seasons," he told the Sunderland Echo.
"I have not had any problems with my team-mates and I feel fine here. But when you get the possibility to play somewhere else, you always have to think about it.
"In general, you might be happy in your job and you don't think about leaving it. But if you have the opportunity to work somewhere else, you will think about it. What still counts for me is not the money.
"I have to know the feeling at a club suits me and I can develop myself as a football player."