Michael Carrick has been handed a major boost on the fitness front with three key senior players now back in training for the club. Middlesbrough are gearing up for another season in the Championship under the guidance of Michael Carrick. The former Manchester United boss has enjoyed an impressive first two seasons on Teesside, reaching the play-off semi-finals and finishing four points off the top six last time out. Boro were expected to push for promotion in the 2023/24 season after a fourth-place finish in 2022/23 but those hopes were dashed for a few reasons. Firstly, the North East outfit…