A "matchday squad" refers to the group of players chosen for a particular game or match. It is the team of players who are available and potentially going to play in that specific match. Full definition
Tomas Kalas and Fulham were beaten 2 - 1 at Aston Villa as John Terry scored his first Villa goal, but Lewis Baker didn't make Middlesbrough's matchday squad for what was another disappointing result, a 1 - 0 defeat at home to Cardiff. (thechels.net)
Johnstone, 23, is yet to make an appearance for United but has trained with the first team, been in matchday squads and is contracted to the club until 2018. (espnfc.com)
This time last season, the French forward was being left out of matchday squads and facing up to criticism from his manager. (espnfc.com)