The 25-year-old Nigerian has recently been linked with a move to Sehlhurst Park, but he may find it tough to obtain a work permit.
Adi, 25, joined the Timbers from Danish side FC Copenhagen in 2014 on an initial loan deal which later became permanent and has since established himself as one of the top forwards in MLS, netting a club-record 33 goals in 69 regular season appearances.
The Nigerian proved instrumental in helping the Oregon-based outfit win their maiden MLS Cup title last December and was rewarded for his performances in March when he received his first senior international call-up.
He has been just as impressive through the opening 12 games of the 2016 campaign, scoring a joint-league-leading eight goals, and there are now suggestions that he could be on the move in the near future.
Yahoo Sports reported last month that both Palace and French club St. Etienne are cashing the 6ft 4in front man’s signature, while Chinese Super League outfit Shanghai Shenhua are also said to be among his potential suitors.
Adi’s representatives, Onfield Management, even confirmed to allnigeriasoccer.com that Alan Pardew’s side have shown an interest in their client along with several other European clubs, but his lack of international caps could prove a major stumbling block toward a possible move to England.
“There is nothing concrete. Agents called us regarding Crystal Palace but no bid has been made for sure,” Onfield Management told the website. “Crystal Palace showed interest but we are not sure he can play in England because of difficulties getting a work permit.
“St. Etienne is interested in Adi but can’t pay such money, two German clubs and one in Belgium also want him."
With his physicality, impressive hold-up play and improving finishing skills, Adi would certainly be an intriguing signing for a Palace side that scored just 39 Premier League goals this past season, but it sounds like Pardew will be forced to look elsewhere in his search for firepower this summer.