After you get back your injured players you can change 2 mc for 1 amc and 1 dmc !
---------gk-------
------dc-dc-dc-----
--------dmc-------
ml------mc-------mr
--------amc-------
-------st---st-------

or bid for a DL and make :
------gk------
-dl-dc-dc-dr-
-------------
-ml--mc--mr-
----amc----
---st-st----