The San Francisco 49ers are open to the idea of signing DeSean Jackson. However, we do not have clarity on how far the 49ers will go in their pursuit of the receiver or if they will even get a chance.ESPN's Adam Schefter reported Tuesday that the 49ers are a team to watch in the Jackson pursuit, tweeting that their interest is "real but guarded." A Washington television station reported that the 49ers called Jackson to set up a visit while he was dining with Redskins officials Monday night.