It is an unusual working arrangement, which was put in place in a caretaker capacity after Brian Laws left to take charge at Sheffield Wednesday.
United's remarkable success since then has seen them overhaul Nottingham Forest at the top of League One, and lose just once in the league - back in December.
Although both are more likely to be in the dugout than the pitch next season, Crosby isn't looking beyond this weekend's visit of Bradford City - when he is expected to partner Steve Foster in the centre of defence once more.
With second-placed Bristol City facing third-placed Forest, United have a great opportunity to strengthen their lead at the top of the table.
"At least one of them has to drop points, so it's up to us to take advantage of the situation by keeping our concentration and getting three points," he told the official SUFC website.
"Fourth play fifth as well, so it is vital that we get a win. On paper this is a game we're expected to win, but Bradford also need the points so it won't be an easy game.
"They won't come here and make it easy for us, they'll regard a point as a great result so it's going to be up to us to break them down."