The England international left the Hammers earlier this month after agreeing to terminate his contract. He had made just one appearance this season, in the Carabao Cup, and only 19 in total since arriving from Arsenal in the summer of 2018.
Wilshere has been plagued by injury but having regained fitness following the coronavirus shutdown, the 28-year-old was desperate to kickstart his Irons career, only to fail to force his way into David Moyes’ plans.
“Last season, when I came back after lockdown, having worked so hard to get back to a good level of fitness and was training every day, it just didn’t feel like my opportunity was ever going to come,” he told BBC Sport. “And, of course, it didn’t.