Essex's Jordan Cox is set to undergo a critical scan on Tuesday following a side injury that could sideline him from England's Test squad against Zimbabwe. The 24-year-old batter, who has represented England in three one-day internationals and two T20s, retired hurt on 103 during Essex's recent defeat by Somerset. The injury occurred as Cox played a shot, leading to an audible cry of pain, and he did not return to the field after reaching his century.

Chris Silverwood, Essex's director of cricket, commented on the incident: "We all heard the moment it happened. It's too early to assess the severity, but we should have more clarity tomorrow." This injury comes at a particularly inopportune time for Cox, who was poised for a Test debut last year against New Zealand before a thumb injury derailed his plans.

Cox's recent form has been impressive, with his century against Somerset marking his second in the County Championship this season. However, with Jamie Smith returning from paternity leave, Cox's role as the spare batter in England's squad is under scrutiny. Jacob Bethell, who filled in for Cox in New Zealand, is currently unavailable due to his commitments in the Indian Premier League.

Should Cox be ruled out, England faces a dilemma in selecting a replacement. Ben McKinney of Durham, despite being highly-rated, is recovering from a back spasm. Tom Banton of Somerset, known for his aggressive batting style, has struggled for consistency this season. Meanwhile, James Rew, Banton's teammate, showcased his potential with a century against Essex, and Tom Haines of Sussex leads the County Championship run-scoring charts with 513 runs in four matches.

The coming days will be pivotal for Cox and England's selection strategy as they prepare for the Zimbabwe series.