ESPN.com first reported the bout Monday.
“Big Ben,” 37, recently returned to action in March, losing a decision to Blagoy Ivanov at after serving a two year suspension from USADA for failing a drug test.
Meanwhile, Arlovski, 40, has not won in three consecutive bouts. A fourth loss to Walt Harris ( who is also fighting on UFC on ESPN 4) was overturned to a no-contest when Harris failed a drug test.
UFC on ESPN 4 is set for July 20 at the AT & T Center in San Antonio, Texas. Current bouts include:
Liz Carmouche (13-6-0) vs. Roxanne Modafferi (23-15-0)
Felipe Dias Colares (8-1-0) vs. Domingo Pilarte (8-1-0)
Mario Bautista (6-1-0) vs. Jin Soo Son (9-3-0)
Sam Alvey (33-12-0) vs. Klidson Abreu (14-3-0)
Alex Caceres (14-12-0) vs. Steven Peterson (17-8-0)
Irene Aldana (10-4-0) vs. Raquel Pennington (9-7-0)
Walt Harris (12-7-0) vs. Alexey Oleynik (57-12-1)
Ben Rothwell (36-11-0) vs. Andrei Arlovski (27-18-0, 2NC)