Jeremy Jeffress had a fine year for the Cubs in 2020, posting a 1.54 ERA and 0.943 WHIP in 22 appearances. He filled in capably while Craig Kimbrel wasn’t saving games; Jeffress posted eight saves in 10 chances, and allowed runs in only three of the 22 outings.
He’s 33 and likely would not be expensive, and the Cubs are apparently talking with him about a return:
Jeffress has posted a sub-2.00 ERA and sub-1.000 WHIP in two of the past three seasons (including 2020), ranking 5th among MLB relievers in ERA since the start of 2018.