Sheffield Wednesday have released 11 out-of-contract players and have opened talks with five others they want to keep.
Highly-rated Atletico Madrid midfielder Saul Niguez has signed a new five-year contract.
The 23-year old previously spent two years at Falkirk, leaving a year ago, but has struggled to pin down a regular place at the npower Championship side and was loaned out to Barnsley and then Carlisle.
Higgingbotham, whose deal is subject to what Motherwell called "registration formalities", will add creativity to Stuart McCall's attacking options following the sale of Jamie Murphy to Sheffield United.
Higginbotham told MFCTV: "I am really pleased and excited to be here and I want to thank the gaffer and all the players for making me feel so welcome."